已选分类
管理学
单选题
41～42题基于以下题干：
林教授患有支气管炎。为了取得疗效，张医生要求林教授立即戒烟。
单选题Financing for a large construction project was provided by a group of banks. When the money was gone before the project was completed, the banks approved additional loans. Now, with funds used up again and completion still not at hand, the banks refuse to extend further loans, although without those loans, the project is doomed.
Which of the following, if true, best explains why the bank"s current reaction is different from their reaction in the previous instance of depletion of funds?
单选题Inthetableabove,whatistheleastnumberoftableentriesthatareneededtoshowthemileagebetweeneachcityandeachoftheotherfivecities?
单选题指数按其反映对象范围的不同，可以分为( )。 A．个体指数和总指数 B．简单指数与加权指数 C．动态指数和静态指数 D．数量指数和质量指数
单选题要了解某市国有工业企业设备情况，则统计总体是( )。 A．该市全部国有工业企业 B．该市每一个国有工业企业 C．该市国有工业企业的全部设备 D．该市国有工业企业的每一台设备
单选题If Carmen had 12 more tapes, she would have twice as many tapes as Rafael. Does Carmen have fewer tapes than Rafael? (1)Rafael has more than 5 tapes. (2)Carmen has fewer than 12 tapes.
单选题总指数的基本形式是( )。 A．个体指数 B．综合指数 C．算术平均指数 D．调和平均指数
单选题REVENUEFORSTOREXDURINGWEEK1Duringweek1,revenuefromeggsprovidedwhatpercentofthetotalrevenueforstoreX?
单选题在方差分析中，如果不同水平之间存在显著性差异，则 A．组间方差仅包含随机误差 B．组间方差仅包含系统误差 C．组间方差包含随机误差和系统误差 D．组间方差不包含随机误差和系统误差
单选题If the product of the integers ω, x, y, and z is 770, and if 1＜ω＜z＜y＜z, what is the value of ω+z? (A) 10 (B) 13 (C) 16 (D) 18 (E) 21
单选题Armtech, a temporary-employment agency, previously gave its employees 2. 5 paid vacation days after each 700 hours worked. Armtech"s new policy is to give its employees 5.0 paid vacation days after each 1,200 hours worked. Therefore, this new policy is more generous to Armtech employees in giving them more vacation days per hour worked than the old policy did.
Which of the following is an assumption on which the argument depends?
单选题If 1＜d＜2, is the tenths' digit of the decimal representation of d equal to 9? (1)d+0.01＜2 (2)d+0.05＞2
单选题服务营销组合不包括（）
单选题"Headhunters" are firms that, for a fee, undertake to recruit for their clients personnel who are greatly needed yet hard to find. The clients, in turn, require that they be offlimits to headhunters whose services they buy; i.e., headhunters cannot raid one client"s staff on behalf of other clients.
Of the following, which would, if feasible, be the best strategy for a company to pursue if that company wanted both to use headhunters to fill a vacancy and, if successful in filling the vacancy, to reduce the risk of losing the newly hired employee to a competitor?
单选题A member of the British Parliament is reputed to have said, "The First purpose of good social reform is to increase the sum total of human happiness. So, any reform which makes somebody happy is achieving its purpose. Since the reform I propose would make my constituents happy, it is a good social reform. "
Which one of the following, if true, most seriously weakens the argument attributed to the member of Parliament?
单选题某公司员工的出勤率属于( )。 A．结构相对数 B．强度相对数 C．比例相对数 D．计划完成相对数
单选题How many gallons of water must be mixed with 1 gallon of a 15-percent salt solution to obtain a 10-percent salt solution? (A) 0.50 (B) 0.67 (C)1.00 (D) 1.50 (E) 2.00
单选题对某单位职工的文化程度进行抽样调查，得知其中80/%的人是高中毕业，抽样平均误差为2/%。当概率为95.45/%时，该单位职工中具有高中文化程度的比重是( )。 A．等于78/% B．大于84/% C．在76/%和84/%之间 D．小于76/%
单选题One night 18 percent of the female officers on a police force were on duty. If 180 officers were on duty that night and half of these were female officers, how many female officers were on the police force?
单选题环比增长率是 A．累计增长量与某一固定时期的观察值之比 B．累计增长量与前一时期的观察值之比 C．逐期增长量与某一固定时期的观察值之比 D．逐期增长量与前一时期的观察值之比
单选题If x+y+z＞0, is z＞1? (1)z＞x+y+1 (2)x+y+1＜0
单选题组织成员通过一定的渠道与管理决策层进行的信息沟通称作：( )
单选题Anydecimalthathasonlyafinitenumberofnonzerodigitsisaterminatingdecimal.Forexample,24,0.82,and5.096arethreeterminatingdecimals.Ifrandsarepositiveintegersandtheratioisexpressedasadecimal,isaterminatingdecimal?(1)90＜r＜100(2)s=4(A)条件(1)充分，但条件(2)不充分．(B)条件(2)充分，但条件(1)不充分．(C)条件(1)和(2)单独都不充分，但条件(1)和条件(2)联合起来充分．(D)条件(1)充分，条件(2)也充分．(E)条件(1)和条件(2)单独都不充分，条件(1)和条件(2)联合起来也不充分．
单选题下列( )指标指一定时间条件下证券在二级市场上流通金额的成交金额。 A．证券发行品种类 B．证券上市品种数 C．证券发行额 D．证券交易额
单选题If S is an infinite set of real numbers, is there a number in S that is less than every other number in S? (1)Every number in S is an integer. (2)Every number in S is positive. (A) 条件(1)充分，但条件(2)不充分． (B) 条件(2)充分，但条件(1)不充分． (C) 条件(1)和(2)单独都不充分，但条件(1)和条件(2)联合起来充分． (D) 条件(1)充分，条件(2)也充分． (E) 条件(1)和条件(2)单独都不充分，条件(1)和条件(2)联合起来也不充分．
单选题A、条件（1）充分，但条件（2）不充分B、条件（2）充分，但条件（1）不充分C、条件（1）和（2）单独都不充分，但条件（1）和条件（2）联合起来充分D、条件（1）充分，条件（2）也充分E、条件（1）和（2）单独都不充分，条件（1）和条件（2）联合起来也不充分
单选题动态相对指标是指( )。 A．同一现象在不同时间不同空间上的对比 B．同一现象在同时间不同空间上的对比 C．不同现象在不同时间同空间上的对比 D．同一现象在不同时间同空间上的对比
单选题S is a set of integers such that i) if a is in S. then -a is in S, and ii) if each of n and b is in S, then ab is in S. Is -4 in S? (1)1 is in S. (2)2 is in S. (A) 条件(1)充分，但条件(2)不充分． (B) 条件(2)充分，但条件(1)不充分． (C) 条件(1)和(2)单独都不充分，但条件(1)和条件(2)联合起来充分． (D) 条件(1)充分，条件(2)也充分． (E) 条件(1)和条件(2)单独都不充分，条件(1)和条件(2)联合起来也不充分．
单选题If k is an integer greater than 44 and less than 51，then which of the following could be the product of 11 and k?
单选题调查期限是( )。 A．调查工作的时限 B．调查资料所属时间 C．调查时期 D．调查时点
单选题Inthefigureabove,PandSarepointsonthex-axis.WhatistheareaofsquarePQRS?(1)ThecoordinatesofpointPare(2,0)(2)ThecoordinatesofpointRare(6,4)
单选题WhatarethecoordinatesofpointBinthexy-planeabove?
单选题Mr. Kramer, the losing candidate in a two-candidate election, received 942, 568 votes, which was exactly 40 percent of all the votes cast．Approximately what percent of the remaining votes would he need to have received in order to have won at least 50 percent of all the votes cast?
单选题已知由各项环比增长速度求总增长速度的方法是( )。 A．将各项环比增长速度连乘 B．将各项环比增长速度连加 C．将各项环比增长速度还原为环比发展速度，然后连加，最后减去1 D．将各项环比增长速度还原为环比发展速度，然后连乘，最后减去1
单选题Theoutlineofasignforanice-creamstoreismadebyplacingofthecircumferenceofacirclewithradius2feetontopofanisoscelestrianglewithheight5feet,asshownabove.Whatistheperimeter,infeet,ofthesign?
单选题Of 30 applicants for a job, 14 had at least 4 years experience, 18 had degrees, and 3 had less than 4 years experience and did not have a degree. How many of the applicants had at least 4 years experience and a degree?
单选题Of 30 applicants for a job, 14 had at least 4 years experience, 18 had degrees, and 3 had less than 4 years experience and did not have a degree. How many of the applicants had at least 4 years experience and a degree? (A) 14 (B) 13 (C) 9 (D) 7 (E) 5
单选题Acomputergeneratesnon-zeronumbersforthefigureabovesothattheproductofthenumbersalonganyverticalcolumnisequaltotheproductofthenumbersinanyhorizontalrow.Whatnumberdoes8represent?(1)uequals6.(2)tequals2.
单选题计算抽样平均误差时，如有多个标准差的资料，应根据( )计算。 A．中间一个 B．平均值 C．最大一个 D．最小一个
单选题Thefigureaboveshowstheshapeofasigntobeplacedinfrontofaflowerstore.Thesignhasasemicircleoneachsideofthesquare.Ifthesignis3centimetersthickandifeachsideofthesquareis50centimeterslong,whatisthevolume,incubiccentimeters,ofthesign?
单选题统计分组后，应使( )。 A．组内具有同质性，组间具有差异性 B．组内具有差异性，组间具有同质性 C．组内具有差异性，组间具有差异性 D．组内具有同质性，组间具有同质性
单选题如果物价上涨10/%，则现在的1元钱( )。 A．只是原来的0.9元 B．与过去的1元钱相等 C．无法与过去进行比较 D．只是原来的0.91元
单选题下列( )指标是指一定时期和地点上市证券的资本总量，且是通过上市证券面值汇总而得到。 A．市价总值 B．上市总值 C．证券交易额 D．证券发行额
单选题
单选题Any United States flag manufactured outside the United States should be banned from importation, since some foreign manufacturers superimpose images on the United States flag and sell such products with relative impunity. United States manufacturers, on the other hand, would face penalties for such violations of the United States flag code.
Which of the "following is the best criticism of the argument above?
单选题21．受人们主观认识影响较大的调查是( )。 A．抽样调查 B．重点调查 C．典型调查 D．统计报表制度
单选题某企业销售额增长了5/%，销售价格下降了3/%，则销售量( )。 A．增长8/% B．增长1.94/% C．增长8.25/% D．增长1.85/%
单选题A museum director, in order to finance expensive new acquisitions, discreetly sold some paintings by major artists. All of them were paintings that the director privately considered inferior. Critics roundly condemned the sale, charging that the museum had lost first-rate pieces, thereby violating its duty as a trustee of art for future generations. A few months after being sold by the museum, those .paintings were resold, in an otherwise stagnant art market, at two to three times the price paid to the museum. Clearly, these prices settle the issue, since they demonstrate the correctness of the critics" evaluation.
The reasoning in the argument is vulnerable to the criticism that the argument does which one of the following?
单选题The large amounts of carbon dioxide now being released into the atmosphere by the burning of fossil fuels will not, in fact, result in a greenhouse effectan increase in average global temperatures. Since plants use carbon dioxide in larger quantities if the supply is increased, they are able to grow larger and multiply more vigorously, and atmospheric carbon dioxide concentrations will eventually become stable.
Which of the following, if true, would most seriously weaken the conclusion that a greenhouse effect will not result from the current release of large amounts of carbon dioxide into the atmosphere?
单选题IfAisthecenterofthecircleshownaboveandAB=BC=CD，whatisthevalueofx?
单选题Thefigureaboverepresentsthefloorofasquarefoyerwithacircularrugpartiallycoveringthefloorandextendingtotheouteredgesofthefloorasshown.Whatistheareaofthefoyerthatisnotcoveredbytherug?(1)Theareaofthefoyeris9squaremeters.(2)Thearea0ftherugis2.25πsquaremeters.
单选题When the integer k is divided by 12, the remainder is 3. Which of the following, when divided by 12, will have a remainder of 6? Ⅰ 2k Ⅱ 6k Ⅲ 4k+6
单选题在假设检验中，β表示( )。 A．P{接受H0|H0为真} B．P{拒绝H0|H0为真} C．P{接受H1|H1为真} D．P{接受H0|H1为真}
单选题Apersonboughtatickettoaballgamefor$15andlatersoldtheticketfor$60.Whatwasthepercentincreaseinthepriceoftheticket?(A)25%(B)(C)75%(D)300%(E)400%
单选题下列分组中( )是按品质标志分组。 A．企业按年生产能力分组 B．产品按质量进行分组 C．家庭按人均收入水平分组 D．人口按年龄分组
单选题The average (arithmetic mean) of 3 different positive integers is 100 and the largest of these 3 integers is 120, what is the least possible value of the smallest of these 3 integers?
单选题If n is a prime number greater than 3, what is the remainder when n2 is divided by 12? (A) 0 (B) 1 (C) 2 (D) 3 (E) 5
单选题当r=0.8时，下列说法正确的是( )。 A．80/%的点都密集在一条直线的周围 B．80/%的点高度相关 C．其线性程度是r=0.4的两倍 D．两变量高度正线性相关
单选题区间估计的置信度是指( ) A．概率 B．允许误差的大小 C．概率保证程度 D．抽样平均误差的大小
单选题已知1998年某自治区牛奶产量的环比发展速度为105/%，1999年为103.5/%，2001年为104/%，又知2001年比1997的定基发展速度为116.4/%，则2000年环比发展速度为( )。 A．105.2/% B．103/% C．102.4/% D．109.2/%
单选题时间序列与变量数列( )。 A．都是根据时间顺序排列的 B．都是根据变量值大小排列的 C．前者是根据时间顺序排列的，后者是根据变量值大小排列的 D．前者是根据变量值大小排列的，后者是根据时间顺序排列的
单选题Houses built during the last ten years have been found to contain indoor air pollution at levels that are, on average, much higher than the levels found in older houses. The reason air-pollution levels are higher in the newer houses is that many such houses are built near the sites of old waste dumps or where automobile emissions are heavy.
Which of the following, if true, calls into question the explanation above?
单选题分工给组织带来的弊端是（）
单选题分销渠道不包括：
单选题从价值角度看，下面哪项活动属于辅助性增值活动：
单选题等级相关系数与简单线性相关系数的相同之处在于( )。 A．适用的条件 B．计算公式 C．取值范围 D．不存在
单选题以某一固定时期作分母而计算出来的指数是( )。 A．环比指数 B．定基指数 C．数量指标指数 D．质量指标指数
单选题Essayist: The existence of a moral order in the universe—i.e., an order in which bad is always eventually punished and good rewarded—depends upon human souls being immortal. In some cultures this moral order is regarded as the result of a karma that controls how one is reincarnated, in others it results from the actions of a supreme being who metes out justice to people after their death. But however a moral order is represented, if human souls are immortal, then it follows that the bad will be punished.
Which one of the following most accurately describes a flaw in the essayist"s reasoning?
单选题
单选题某企业5月份计划销售收入比上月增长8/%，实际增长12/%，其超计划完成程度为( )。 A．103.70/% B．50/% C．150/% D．3.7/%
单选题In a refinery, the capacity of oil tank A is 70 per cent of the capacity of oil tank B. How many more gallons of oil are in tank A than in tank B? (1)Tank A is 90 percent full; tank B is 50 percent full. (2)When full, tank A contains 50,000 gallons of oil.
单选题Twopulleysareconnectedbyabeltasshowninthedrawingabove.IfpulleyQmakes300evolutionsperminute,howmanyrevolutionsperminutedoespulleyPmake?(1)Thelengthofthebeltis12π.(2)TheratiooftheradiusofpulleyPtotheradiusofpulleyQis2to1.
单选题统计整理的关键在( )。 A．对调查资料进行审核 B．对调查资料进行统计分组 C．对调查资料进行汇总 D．编制统计表
单选题非参数检验方法中，需用列联表的是( )。 A．拟合优度检验 B．独立性检验 C．成对比较检验 D．曼—惠特尼U检验
单选题因素分析的根据是( )。 A．总指数或类指数 B．两因素指数 C．平均指标指数 D．指数体系
单选题In 1985 the city"s Fine Arts Museum sold 30,000 single-entry tickets. In 1986 the city"s Folk Arts and Interior Design museums opened, and these three museums together sold over 80,000 such tickets that year. These museums were worth the cost, since more than twice as many citizens are now enjoying the arts.
Which of the following, if true, most seriously weakens the author"s assertion that more than twice as many citizens are now enjoying the arts?
单选题If n is a positive integer, is the value of b-a at least twice the value of 3n-2n? (1)a=2n+1 and b=3n+1 (2)n=3 (A)条件(1)充分，但条件(2)不充分． (B)条件(2)充分，但条件(1)不充分． (C)条件(1)和(2)单独都不充分，但条件(1)和条件(2)联合起来充分． (D)条件(1)充分，条件(2)也充分． (E)条件(1)和条件(2)单独都不充分，条件(1)和条件(2)联合起来也不充分．
单选题Ifs1,s2,s3…isthesequencesuchthatsnforallpositiveintegersn,thentheproductofthefirst10termsofthissequenceis
单选题Forallrealnumbersν,theoperationν*isdefinedbytheequation.If(ν*)*=8,thenν=
单选题A toy store regularly sells all stock at a discount of 20 percent to 40 percent. If an additional 25 percent were deducted from the discount price during a special sale, what would be the lowest possible price of a toy costing $16 before any discount? (A) $5.60 (B) $7.20 (C)$8.80 (D) $9.60 (E) $15.20
单选题成数与成数方差的关系是( )。 A．成数的数值越接近于1，成数的方差越大 B．成数的数值越接近于0，成数的方差越大 C．成数的数值越接近于0.5，成数的方差越大 D．成数的数值越大，成数的方差越大
单选题If x, y, and z are single-digit integers and 100(x)+1,000(y)+10(z)=N, what is the units' digit of the number N?
单选题Ifmoneyisinvestedatrpercentinterest,compoundedannually,theamountoftheinvestmentwilldoubleinapproximatelyyears．IfPat'sparentsinvested$5,000inalong-termandthatpays8percentinterest,compoundedannually,whatwillbetheapproximatetotalamountoftheinvestment18yearslater,whenPatisreadyforcollege?(A)$20,000(B)$15,000(C)$12,000(D)$10,000(E)$9,000
单选题Virginia, Adrienne, and Dennis have taught history for a combined total of 96 years. If Virginia has taught for 9 more years than Adrienne and for 9 fewer years than Dennis, for how many years has Dennis taught? (A) 23 (B) 32 (C) 35 (D) 41 (E) 44
单选题Whichofthefollowinginequalitiesisanalgebraicexpressionfortheshadedpartofthenumberlineabove?
单选题( )反映期末各项贷款与各项存款的比例关系。 A．信贷资金自给率 B．存款余额比率 C．存款变动 D．存款余额
单选题If ⊙ denotes a mathematical operation, does x⊙y=y⊙x for all x and y? (1)For all z and y, x⊙y=2(x2+y2) (2)For all y, 0⊙y=2y2
单选题统计表从内容构成上看( )。 A．由总标题、横行标题、纵栏标题和指标数值组成 B．由主词和宾词组成 C．由主语和宾语组成 D．由实词和虚词组成
单选题下四分位数是处于数据( )位置的值。 A．75/% B．40/% C．80/% D．25/%
单选题Car X and car Y ran a 500-kilometer race, what was the average speed of car X? (1)Car X completed the race in 6 hours and 40 minutes. (2)Car Y, at an average speed of 100 kilometers per hour, completed the race 1 hour and 40 minutes before car X crossed the finish line. (A) 条件(1)充分，但条件(2)不充分． (B) 条件(2)充分，但条件(1)不充分． (C) 条件(1)和(2)单独都不充分，但条件(1)和条件(2)联合起来充分． (D) 条件(1)充分，条件(2)也充分． (E) 条件(1)和条件(2)单独都不充分，条件(1)和条件(2)联合起来也不充分．
单选题若各年环比增长速度保持不变，则各年增长量( )。 A．逐年增加 B．逐年减少 C．保持不变 D．无法作结论
单选题一组数据的分布为偏态分布时，用( )作为该组数据的概括性度量比较适宜。 A．众数 B．均值 C．最小值 D．最大值
单选题5．分组标志一经确定就( )。 A．掩盖了总体单位在此标志下的性质差异 B．突出了总体单位在此标志下的性质差异 C．突出了总体单位在其他标志下的性质差异 D．使得总体内部的差异消失了
单选题 The following data sufficiency problems consist of
a question and two statements, labeled (1) and (2), in which certain data are
given. You have to decide whether the data given in the statements are
sufficient for answering the question. Using the data given in the statements
plus your knowledge of mathematics and everyday facts (such as the number of
days in July or the meaning of counter- clockwise), you must indicate
whether Ａ. Statement (1) ALONE is sufficient, but statement (2)
alone is not sufficient. Ｂ. Statement (2) ALONE is sufficient,
but statement (1) alone is not sufficient. Ｃ. BOTH statements
TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.
Ｄ. EACH statement ALONE is sufficient. Ｅ. Statements (1)
and (2) TOGETHER are NOT sufficient.
单选题某企业职工的工资分为四组：(1)800元以下；(2)800～1000元；(3)1000～1500元；(4)1500元以上，则1500元以上的这组组中值应近似为( )元。 A．1500 B．1600 C．1750 D．2000
单选题If the sum of a set of ten different positive prime numbers is an even number, which of the following prime numbers CANNOT be in the set? (A) 2 (B) 3 (C) 5 (D) 7 (E) 11
单选题Neighboring landholders: Air pollution from the giant aluminum refinery that has been built next to our land is killing our plants.
Company spokesperson: The refinery is not to blame, since our study shows that the damage is due to insects and fungi. Which of the following, if true, most seriously weakens the conclusion drawn by the company spokesperson?
单选题Like most other coastal towns in Norway, the town of Stavanger was quiet and peaceful until the early 1960"s, when it became Norway"s center for offshore oil exploration. Between then and now, violent crime and vandalism in Stavanger have greatly increased. Stavanger"s social problems probably resulted from the oil boom, since violent crime and vandalism have remained low in coastal towns in Norway that have had no oil boom.
Which of the following most accurately describes the method of reasoning employed in the argument?
单选题If n is a positive integer, is the value of b-a at least twice the value of 3n-2n? (1)a=2n+1 and b=3n+1 (2)n=3
单选题A merchant paid $300 for a shipment of x identical calculators. The merchant used 2 of the calculators as demonstrators and sold each of the others for $5 more than the average (arithmetic mean) cost of the X calculators. If the total revenue from the sale of the calculators was $120 more than the cost of the shipment, how many calculators were in the shipment?
单选题All actors are exuberant people and all exuberant people are extroverts, but nevertheless it is true that some shy people are actors.
If the statements above are true, each of the following must also be true EXCEPT:
单选题Bowls X and Y each contained exactly 2 jelly beans, each of which was either red or black, One of the jelly beans in bowl X was exchanged with one of the jelly beans in bowl Y. After the exchange, were both of the jelly beans in bowl X black? (1)Before the exchange, bowl X Contained 2 black jelly beans. (2)After the exchange, bowl Y contained 1 jelly bean of each color.
单选题Inthefigureabove,lineACrepresentsaseesawthatistouchinglevelgroundatpointA.IfBisthemidpointofAC,howfarabovethegroundispointC?(1)x=30(2)PointBis5feetabovetheground.
单选题If the sum of the first n positive integers is S，what is the sum of the first n positive even integers, in terms of S?
单选题Isthepositiveintegernequaltothesquareofaninteger?(1)Foreveryprimenumberp,ifpisadivisorofn,thensoisp2.(2)isaninteger(A)条件(1)充分，但条件(2)不充分．(B)条件(2)充分，但条件(1)不充分．(C)条件(1)和(2)单独都不充分，但条件(1)和条件(2)联合起来充分．(D)条件(1)充分，条件(2)也充分．(E)条件(1)和条件(2)单独都不充分，条件(1)和条件(2)联合起来也不充分．
单选题Psychological research indicates that college hockey and football players are more quickly moved to hostility and aggression than are college athletes in noncontact sports such as swimming. But the researchers" conclusion—that contact sports encourage and teach participants to be hostile and aggressive—is untenable. The football and hockey players were probably more hostile and aggressive to start with than the simmers.
Which of the following, if true, would most strengthen the conclusion drawn by the psychological researchers?
单选题No one can be licensed as an electrician in Parker County without first completing a certain course in electrical safety procedures. All students majoring in computer technology at Parker County Technical College must complete that course before graduating. Therefore, any of the college"s graduates in computer technology can be licensed as an electrician in Parker County.
The answer to which of the following would be most helpful in evaluating the argument?
单选题右图中，若△ABC的面积为1，△AEC、△DEC、△BED的面积相等，则△AED的面积＝()。
单选题Inacertainflowershop,whichstocksfourtypesofflowerthereareasmanyvioletsascarnation，andasmanytulipsasviolets．Ifthereareequalnumbersofrosesandtulips，whatpercentoftheflowersintheshoparecarnations?(A)10%(B)33%(C)40%(D)50%(E)60%
单选题总标题是统计表的名称，一般写在( )。 A．表的左方 B．表的右方 C．表的上端中部 D．表的上方
单选题What is the least possible product of 4 different integers, each of which has a value between -5 and 10, inclusive?
单选题At a certain state university last term, there were p students each of whom paid either the full tuition of x dollars or half the full tuition. What percent of the tuition paid by the p students last term was tuition from students who paid the full tuition? (1)Of the P students, 20 percent paid the full tuition. (2)The p students paid a total of $91.2 million for tuition last term. (A) 条件(1)充分，但条件(2)不充分． (B) 条件(2)充分，但条件(1)不充分． (C) 条件(1)和(2)单独都不充分，但条件(1)和条件(2)联合起来充分． (D) 条件(1)充分，条件(2)也充分． (E) 条件(1)和条件(2)单独都不充分，条件(1)和条件(2)联合起来也不充分．
单选题A certain company has records stored with a record-storage firm in 15-inch by 12-inch by 10-inch boxes. The boxes occupy 1.08 million cubic inches of space. If the company pays $0.25 per box per month for record storage, what is the total amount that the company pays each month for record storage?
单选题A necklace is made by stringing N individual beads together in the repeating pattern red bead, green bead, white bead, blue bead, and yellow bead. If the necklace design begins with a red bead and ends with a white bead, then N could equal (A) 16 (B) 32 (C) 41 (D) 54 (E) 68
单选题综合指数包括( )。 A．个体指数和总指数 B．定基指数和环比指数 C．平均数指数和平均指标指数 D．数量指数和质量指数
单选题Company R's annual profit has increased by a constant amount each calendar year since 1985. What was Company R's annual profit in 1991? (1)In 1985 Company R's annual profit was $212.000; in 1989 Company R's annual profit was $242,000. (2)Company R's annual profit has increased by $7,500 each year since 1985. (A) 条件(1)充分，但条件(2)不充分． (B) 条件(2)充分，但条件(1)不充分． (C) 条件(1)和(2)单独都不充分，但条件(1)和条件(2)联合起来充分． (D) 条件(1)充分，条件(2)也充分． (E) 条件(1)和条件(2)单独都不充分，条件(1)和条件(2)联合起来也不充分．
单选题检查产品寿命应使用( )调查方法。 A．普查 B．抽样调查 C．重点调查 D．典型调查
单选题有20个工人看管机器台数资料如下：2，5，4，4，3，4，3，4，4，2，2，4，3，4，6，3，4，5，2，4。如按以上资料编制分配数列，应采用( )。 A．单项式分组 B．等距分组 C．不等距分组 D．以上几种分组均可以
单选题If x and y are positive integers and x is a multiple of y，is y=2?
(1)y≠1
(2)x+2 is a multiple of y.
单选题If 1＜d＜2, is the tenths' digit of the decimal representation of d equal to 9? (1)d+0.01＜2 (2)d+0.05＞2 (A) 条件(1)充分，但条件(2)不充分． (B) 条件(2)充分，但条件(1)不充分． (C) 条件(1)和(2)单独都不充分，但条件(1)和条件(2)联合起来充分． (D) 条件(1)充分，条件(2)也充分． (E) 条件(1)和条件(2)单独都不充分，条件(1)和条件(2)联合起来也不充分．
单选题How many minutes long is time period X? (1)Time period X is 3 hours-long. (2)Time period X starts at 11 p.m. and ends at 2 a.m. (A) 条件(1)充分，但条件(2)不充分． (B) 条件(2)充分，但条件(1)不充分． (C) 条件(1)和(2)单独都不充分，但条件(1)和条件(2)联合起来充分． (D) 条件(1)充分，条件(2)也充分． (E) 条件(1)和条件(2)单独都不充分，条件(1)和条件(2)联合起来也不充分．
单选题调查某市全部工业企业设备的使用状况，则调查对象是( )。 A．全部工业企业 B．每一个工业企业 C．全部工业企业的设备 D．全部工业企业设备的使用情况
单选题下列( )属于地产市场交易规模统计。 A．住宅买卖成交量 B．招标土地出让量 C．非住宅买卖成交量 D．住宅租赁成交量
单选题风险报酬是指（）
单选题假设检验是检验( )的假设值是否成立。 A．样本指标 B．总体指标 C．样本方差 D．样本平均数
单选题
股份有限公司的设立，可以采取发起设立和（ ）的方式。
A、认购设立 B、授权设立 C、募集设立 D、登记设立
单选题A certain clock marks every hour by striking a number of times equal to the hour and the time required for a stroke is exactly equal to the time interval between strokes. At 6:00 the time lapse between the beginning of the first stroke and the end of the last stroke is 22 seconds. At 12:00, how many seconds elapse between the beginning of the first stroke and the end of the last stroke?
单选题设某地区有100家独立核算的生产企业，要研究这些企业的产品生产情况，总体单位是( )。 A．每个生产企业 B．100家生产企业 C．每一件产品 D．全部产品
单选题划分连续变量的组限时，相邻组的组限必须( )。 A．重叠 B．相近 C．不等 D．间断
单选题At 9 a.m, a hiker was due south of point P. What direction was point P from her position at noon? (1)From 9 a.m until 11 a.m she walked due east at 2 miles per hour, and from 11 a. m until noon, she walked due north at 3 miles per hour. (2)At noon, she is exactly 4.5 miles from point P. (A) 条件(1)充分，但条件(2)不充分． (B) 条件(2)充分，但条件(1)不充分． (C) 条件(1)和(2)单独都不充分，但条件(1)和条件(2)联合起来充分． (D) 条件(1)充分，条件(2)也充分． (E) 条件(1)和条件(2)单独都不充分，条件(1)和条件(2)联合起来也不充分．
单选题( )是指企业在一定时期内销售产品或商品，提供劳务等经营活动而取得的各种收入。 A．销售收入 B．劳务收入 C．技术转让收入 D．产品销售收入
单选题Foranyintegerngreaterthan1,denotestheproductofalltheintegersfrom1ton,inclusive.Howmanyprimenunbersaretherebetweenand,inclusive?
单选题What is the greatest commom divisor of positive integers m and n? (1)m is a prime number. (2)m and n are consecutive integers. (A) 条件(1)充分，但条件(2)不充分． (B) 条件(2)充分，但条件(1)不充分． (C) 条件(1)和(2)单独都不充分，但条件(1)和条件(2)联合起来充分． (D) 条件(1)充分，条件(2)也充分． (E) 条件(1)和条件(2)单独都不充分，条件(1)和条件(2)联合起来也不充分．
单选题If n and p are different positive prime numbers, which of the integers n4, p2, and np has (have) exactly 4 positive divisors? (A) n4only (B) p3only (C) nponly (D) n4andnp (E) p3andnp
单选题Dense snow cover can cause unusually harsh weather patterns to persist. If a severe winter storm blankets the Great Plains, the snow cover reflects the sun"s radiation back into space and thus keeps the temperature of the ground tow. Consequently, cold air moving down from Canada remains cold enough to cause more snowstorms.
Which of the following is a conclusion that can be properly drawn from the information above?
单选题某高新技术开发区现有人口11万，有8家医院(其病床数合计为700床)，则该开发区每万人的病床数为63.636。这个指标属于( )。 A．平均指标 B．相对指标 C．总量指标 D．发展水平指标
单选题如果数据分布很不均匀，则应编制( )。 A．开口组 B．闭口组 C．等距数列 D．不等距数列
单选题Thehexagonalfaceoftheblockshowninthefigureabovehassidesofequallengthandanglesofequalmeasure.Ifeachlateralfaceisrectangular,whatisthearea,insquareinches,ofonelateralface?
单选题质量控制图的目的是 A．及时发现系统性因素 B．及时发现随机性因素 C．及时发现生产过程是否从稳定状态变为不稳定状态 D．及时发现生产中的质量偏差
单选题If 77,777=70, 707+(7.07×n), then n
单选题∑q1p0-∑q0p0表示( )。 A．N于价格变动引起的产值增减数 B．由于价格变动引起的产量增减数 C．由于产量变动引起的价格增减数 D．N于产量变动引起的产值增减数
单选题企业投资统计不包括( )。 A．企业投资环境统计 B．资本筹措统计 C．投资方案选择统计 D．投资效果评价统计 E．生态环境统计
单选题身高y与体重x之间的关系是( )。 A．函数关系 B．无关系 C．互为因果关系 D．严格的依存关系
单选题当所有观测值都落在回归直线yc=a+bx上，则x与y之间的相关系数( )。 A．r=0 B．r=1 C．r=-1 D．|r|=1
单选题过点A(2，0)向圆x2+y2＝1作两条切线AM和AN(见右图)，则两切线和弧MN所围成的面积(图中阴影部分)为()。
单选题Government bans on the dumping of sludge anywhere in the ocean are based on the belief that the spread of sludge by ocean currents poses a danger to people. Since it is not clear that sludge dumped on the ocean bottom, far from coasts, would endanger people, the bans should be revised to apply only to coastal waters.
Each of the following, if true, supports the conclusion that the bans on ocean dumping should be revised EXCEPT:
单选题At a certain university, if 50 percent of the people who inquire about admission policies actually submit applications for admission, what percent of those who submit applications for admission enroll in classes at the university? (1)Fifteen percent of those who submit applications for admission are accepted at the university. (2)Eighty percent of those who are accepted send a deposit to the university.
单选题Foragroupofnpeople,kofwhomareofthesamesex,theexpressionyieldsanindexforacertainphenomenoningroupdynamicsformembersofthatsex.Foragroupthat,consistsof20people,4ofwhomarefemales,byhowmuchdoestheindexforthefemalesexceedtheindexforthemalesinthegroup?
单选题符号检验与威尔科克森带符号的等级检验相比，( )。 A．方法简单，且更为有效 B．方法简单，但有效性较差 C．方法复杂，且有效性较差 D．方法复杂，但更为有效
单选题Board member: As a longtime member of the college"s board of trustees, I believe that the board has functioned well in the past because each of its members has had a broad range of experience and interests. Thus, if in the future any members are elected primarily to press for a particular policy, such as reducing tuition, the board will function leas well.
In drawing the conclusion above, the board member must have been making which of the following assumptions?
单选题What is the volume of a certain rectangular solid?
(1)Two adjacent faces of the solid have areas 15 and 24, respectively.
(2)Each of two opposite faces of the solid has area 40.
单选题In△PQRabove,isPQ＞PR?(1)x=y(2)y=z
单选题Three stacks containing equal numbers of chips are to be made from 9 red chips, 7 blue chips，and 5 green chips．If all of these chips are used and each stack contains at least 1 chip of each color, what is the maximum number of red chips in any one stack?
单选题预测分析报告要求( )。 A．目标集中，重点突出，认识深刻 B．具有针对性，单刀直入 C．有较强的时效性 D．数据准确，定量分析与定性分析结合，提出预测结果具有的置信区间和可信度
单选题将统计总体按照一定标志区分为若干个组成部分的统计方法是( )。 A．统计整理 B．统计分析 C．统计调查 D．统计分组
单选题 LEAGUE RESULTS Team Number of Games Won A 4 B 7 C 9 D 2 E 2 X According to the incomplete table above, if each of the 6 teams in the league played each of the other teams exactly twice and there were no ties, how many games did team X win? (Only 2 teams play in a game.) (A) 4 (B) 5 (C) 6 (D) 8 (E) 10
单选题In respectable periodicals, books are given reviewing space in inverse proportion to the likely size of their sales. Airport and supermarket bookstalls stock only books that are expected to sell in large numbers. Consequently, those who buy books at such bookstalls have to do so without any guidance whatever from the book reviewers whose work is published in respectable periodicals.
Which of the following is a valid criticism of the argument above?
单选题Caterpillars off all species produce an identical hormone called "juvenile hormone" that maintains feeding behavior. Only when a caterpillar has grown to the right size for pupation to take place does a special enzyme halt the production of juvenile hormone. This enzyme can be synthesized and will, on being ingested by immature caterpillars, kill them by stopping them from feeding.
Which of the following, if true, most strongly supports the view that it would not be advisable to try to eradicate agricultural pests that go through a caterpillar stage by spraying croplands with the enzyme mentioned above?
单选题Since applied scientific research is required for technological advancement, many have rightly urged an increased emphasis in universities on applied research. But we must not give too little attention to basic research, even though it may have no foreseeable application, for tomorrow"s applied research will depend on the basic research of today.
If the statements above are true, which of the following can be most reliably inferred?
单选题Iftheareaofthecircleaboveis64π,whatisthevalueofk?
单选题WhatfractionalpartofthetotalsurfaceareaofcubeCisred?(1)Eachof3facesofcisexactlyred.(2)Eachof3facesofCisentirelywhite.
单选题某省1995～2005年按年排列的第三产业占全部产业比重的时间数列是( )。 A．比较相对指标时间数列 B．强度相对指标时间数列 C．结构相对指标时间数列 D．平均指标时间数列
单选题在其他条件不变的情况下，下列说法正确的是 A．置信概率越大，所需的样本容量也就越小 B．样本容量与总体方差成反比 C．样本容量与边际误差的平方成正比 D．样本容量与边际误差的平方成反比
单选题设a，b，c为整数，且|a-b|20+|c-a|41＝1，则|a-b|+|a-c|+|b-c|＝(
)。
单选题If n is a positive integer and k+2=3n, which of the following could NOT be a value of K?
单选题统计报表大多数属于( )。 A．一次性全面调查 B．经常性全面调查 C．经常性非全面调查 D．一次性非全面调查
单选题Is the integer n a multiple of 140?
(1) n is a multiple of 10.
(2) n is a multiple of 14.
单选题在相关分析中，对两个变量的要求是( )。 A．都是随机变量 B．都不是随机变量 C．一个是随机变量，一个是确定性变量 D．都是确定性变量
单选题
单选题In how many arrangements can a teacher seat 3 girls and 3 boys in a row of 6 seats if the boys are to have the first, third, and fifth seats?
单选题某企业7月份计划要求成本降低3/%，实际降低5/%，则( )计划程度。 A．超额完成2.06/% B．完成97.94/% C．超额完成5/% D．完成95/%
单选题
工商行政管理的主体是（ ）。
A、国家 B、工商局 C、国务院 D、国家工商行政管理总局
单选题Ifnisaninteger,isaninteger?(1)isaninteger.(2)isaninteger.
单选题QuadrilateralRSTUshownaboveisasiteplanforaparkinglotinwhichsideRUisparalleltosideSTandRUislongerthanST.Whatistheareaoftheparkinglot?(1)RU=80meters(2)TU=meters
单选题Many institutions of higher education suffer declining enrollments during periods of economic slowdown. At two-year community colleges, however, enrollment figures boom during these periods when many people have less money and there is more competition for jobs.
Each of the following, if true, helps to explain the enrollment increases in two-year community colleges described above EXCEPT:
单选题If x=y2, what is the value of y-x? (1)x=4 (2)x+y=2
单选题( )是指工业企业一定时期内以货币形式表现的工业生产活动的最终成果，以现行出厂价计算的，反映企业生产过程中新增加的价值。 A．企业工业总产值 B．企业工业增加值 C．企业工业销售产值 D．企业工业出口交货值
单选题Inspection system X and inspection system Y, though based on different principles, each detect all product flaws, but they each also erroneously reject three percent of flawless products. Since false rejections are very costly, money will be saved by installing both systems, instead of either one or the other, and rejecting only products found flawed by both.
The argument above requires which of the following assumptions?
单选题实际工作中，最常用的类型抽样是( )。 A．定额分配 B．等额分配 C．等比例分配 D．最优分配
单选题A certain encyclopedia has 20 volumes, each of which is ω inches wide, k inches long and t inches thick. If all of the volumes are to be tightly packaged in one rectangular box that is k inches wide and ω inches deep inside, could the inside length of the box be less than 35 inches. (1)t=1.5 (2)ω=9 and k=12
单选题The geese that gather at the pond of a large corporation create a hazard for executives who use the corporate helicopter, whose landing site is 40 feet away from the pond. To solve the problem, the corporation plans to import a large number of herding dogs to keep the geese away from the helicopter.
Which of the following, if a realistic possibility, would cast the most serious doubt on the prospects for success of the corporation"s plan?
单选题平行分组与复合分组的主要区别在于( )。 A．分组标志的多少不一样 B．分组数目的多少不相同 C．分组的方式不一样 D．研究目的和对象不相同
单选题现有一数列：3，9，27，81，243，729，2 187，反映其平均水平最好用( )。 A．算术平均数 B．调和平均数 C．几何平均数 D．众数
单选题随着经验增加，能够形成单位成本下降趋势的原因不包括：
单选题从事于同类产品的不同产销阶段生产经营的企业所进行的并购，称为：
单选题A store currently charges the same price for each towel that it sells. If the current price of each towel were to be increased by $1,10 fewer of the towels could be bought for $120, excluding sales tax. What is the current price of each towel? (A) $1 (B) $2 (C) $3 (D) $4 (E) $12
单选题当一组数据的分布为对称分布时，最好用( )作为该组数据的概括性度量。 A．众数 B．均值 C．中位数 D．极差
单选题对职工的生活水平状况进行分组研究，正确地选择分组标志应当用( )。 A．职工月工资总额的多少 B．职工人均月收入额的多少 C．职工家庭成员平均月收入额的多少 D．职工的人均月岗位津贴及奖金的多少
单选题IftankXcontainsonlygasoline,howmanykilolitersofgasolineareintankX?(1)IfofthegasolineintankXwerepumpedoutthetankwouldbefilledtoofitscapacity.(2)If0.75kiloliterofgasolinewerepumpedintotankX,itwouldbefilledtocapacity.(A)条件(1)充分，但条件(2)不充分．(B)条件(2)充分，但条件(1)不充分．(C)条件(1)和(2)单独都不充分，但条件(1)和条件(2)联合起来充分．(D)条件(1)充分，条件(2)也充分．(E)条件(1)和条件(2)单独都不充分，条件(1)和条件(2)联合起来也不充分．
单选题If,wherepandqarenonzerointegers,isnaninteger?(1)n2isaninteger.(2)isaninteger.
单选题Hardin argued that grazing land held in common (that is, open to any user) would always be used less carefully than private grazing land. Each rancher would be tempted to overuse common land because the benefits would accrue to the individual, while the costs of reduced land quality that results from overuse would be spread among all users. But a study comparing 217 million acres of common grazing land with 433 million acres of private grazing land showed that the common land was in better condition.
Which of the following, if true and known by the ranchers, would best help explain the results of the study?
单选题
下列哪些不是回扣认定的特征：（ ）
A、帐外
B、暗中
C、折扣
D、返还方式以现金实物或其他名目给付财物
单选题下列( )数据是顺序型品质数据。 A．王仲的性别为男 B．李明的数学期中成绩为78分 C．江涛的学历为大学本科 D．陶敏的年龄25岁
单选题Many people acquire software programs for their home computers by illegally copying those programs rather than purchasing them. People who own home computers must be making, on average, fewer illegal copies of software programs than before, however, since the average number of software programs that people purchase to use on their home computers has increased substantially over the past five years.
Which of the following, if true, most strengthens the argument?
单选题A cashier mentally reversed the digits of one customer's correct amount of change and thus gave the customer art incorrect amount of change. If the cash register contained 45 cents more than it should have as a result of this error, which of the following could have been the correct amount of change in cents? (A) 14 (B) 45 (C) 54 (D) 65 (E) 83
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单选题 The following data sufficiency problems consist of a
question and two statements, labeled (1) and (2), in which certain data are
given.You have to decide whether the data given in the statements are
sufficient for answering the question. Using the data given in the
statements plus your knowledge of mathematics and everyday facts (such
as the number of days in July or the meaning of counterclockwise), you must
indicate whether Ａ. Statement (1) ALONE is sufficient, but
statement (2) alone is not sufficient. Ｂ. Statement (2) ALONE
is sufficient, but statement (1) alone is not sufficient. Ｃ.
BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is
sufficient. Ｄ. EACH statement ALONE is sufficient.
Ｅ. Statements (1) and (2) TOGETHER are NOT sufficient.
单选题If the two-digit integers M and N are positive and have the same digits, but in reverse order, which of the following CANNOT be the sum of M and N? (A) 181 (B) 165 (C) 121 (D) 99 (E) 44
单选题根据标准，某种材料设计的平均强力为8克。现改进工艺后，测得100个强力数据的均值为8.3，假定标准差不变。如果要检验是否由于工艺改进而使平均强力提高，则合理的零假设与备择假设应为 A．H0：μ≥8 H1：μ＜8 B．H0：μ＜8 H1：μ＞8 C．H0：μ≤8 H1：μ＞8 D．H0：μ=8 H1：μ≠8
单选题A 2-year certificate of deposit is purchased for k dollars. If the certificate earns interest at an annual rate of 6 percent compounded quarterly, which of the following represents the value, in dollars, of the certificate at the end of the 2 years?
单选题人口数与出生人数相比，( )。 A．前者是时期指标，而后者是时点指标 B．前者是时点指标，而后者是时期指标 C．两者都是时点指标 D．两者都是时期指标
单选题The public is well aware that high blood cholesterol levels raise the risk of stroke caused by blood clots. But a recent report concludes that people with low blood cholesterol levels are at increased risk of the other lethal type of stroke-cerebral hemorrhage, caused when a brain artery bursts. The report suggests that because blood cholesterol plays a vital role in maintaining cell membranes, low blood cholesterol weakens artery walls, making them prone to rupture. The conclusion thus supports a long-standing contention by Japanese researchers that Western diets better protect against cerebral hemorrhage than do non-Western diets.
The argument is based on which one of the following assumptions?
单选题Company R"s annual profit has increased by a constant amount each calendar year since 1985. What was Company R"s annual profit in 1991?
(1)In 1985 Company R"s annual profit was $212.000; in 1989 Company R"s annual profit was $242,000.
(2)Company R"s annual profit has increased by $7,500 each year since 1985.
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单选题Nuclear fusion is a process whereby the nuclei of atoms are joined, or "fused," and in which energy is released. One of the by-products of fusion is helium-4 gas. A recent fusion experiment was conducted using "heavy" water contained in a sealed flask. The flask was, in turn, contained in an air-filled chamber designed to eliminate extraneous vibration. After the experiment, a measurable amount of helium-4 gas was found in the air of the chamber. The experimenters cited this evidence in support of their conclusion that fusion had been achieved.
Which one of the following, if tree, would cast doubt on the experimenters" conclusion?
单选题企业在不同的细分市场推出不同的产品，并在渠道、促销和定价方面都加以相应改变，以适用不同细 分市场的需要，这被称为：
单选题私营企业不包括：
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单选题Inacertainanimalpopulation,foreachofthefirst3monthsoflife,theprobabilitythatananimalwilldieduringthatmonthis.Foragroupof200newbornmembersofthepopulation,approximatelyhowmanywouldbeexpectedtosurvivethefirst3monthsoflife?
单选题
办案人员调取原始凭证确有困难的，可以复制，复制件应当标明（ ），并由出具书证人签名或者盖章。
A、经核对无误 B、经核对与原件无误
C、经查证无误 D、经查证与原件无误
单选题Most geologists believe oil results from chemical transformations of hydrocarbons derived from organisms buried under ancient seas. Suppose, instead, that oil actually results from bacterial action on other complex hydrocarbons that are trapped within the Earth. As is well known, the volume of these hydrocarbons exceeds that of buried organisms. Therefore, our oil reserves would be greater than most geologists believe.
Which of the following, if true, gives the strongest support to the argument above about our oil reserves?
单选题某商品价格发生变化，现在的100元只值原来的90元，则价格指数为( )。 A．10/% B．90/% C．110/% D．111/%
单选题如果所有标志值的频数都扩大为原来的5倍，而标志值仍然不变，则算术平均数( )。 A．不变 B．扩大到5倍 C．减少为原来的1/5 D．不能预测其变化
单选题抽样调查中，无法消除的误差是( )。 A．随机误差 B．责任心误差 C．登记性误差 D．系统性误差
单选题2．某管理局对其所属企业的生产计划完成百分比采用如下分组，请指出哪项是正确的?( ) A．80/%～89/% 90/%～99/% 100/%～109/% 110/%以上 B．80/%～以下 80.1/%～90/% 90.1/%～100/% 100.1/%～110/% C．90/%以下 90/%～99/% 100/%～110/% 110/%以上 D．85/%以上 85/%～95/% 95/%～105/% 105/%～115/%
单选题Can the positive integer p be expressed as the product of two integers, each of which is greater than 1? (1)31＜p＜37 (2)p is odd (A) 条件(1)充分，但条件(2)不充分． (B) 条件(2)充分，但条件(1)不充分． (C) 条件(1)和(2)单独都不充分，但条件(1)和条件(2)联合起来充分． (D) 条件(1)充分，条件(2)也充分． (E) 条件(1)和条件(2)单独都不充分，条件(1)和条件(2)联合起来也不充分．
单选题普查规定标准时点是为了( )。 A．避免登记的重复与遗漏 B．确定调查对象的范围 C．确定调查单位 D．确定调查期限
单选题It is widely assumed that a museum is helped financially when a generous patron donates a potential exhibit. In truth, however, donated objects require storage space, which is not free, and routine conservation, which is rather expensive. Therefore, such gifts exacerbate rather than lighten the demands made on a museum"s financial resources.
Which of the following, if true, most seriously weakens the argument above?
单选题If ω, x, y, and z are non-negative integers, each less than 3, and ω(33)+x(32)+y(3)+z=34，thenω+z= (A) 0 (B) 1 (C) 2 (D) 3 (E) 4
单选题Theadditionproblemaboveshowsfourofthe24differentintegersthatcanbeformedbyusingeachofthedigits1,2,3and4exactlyonceineachinteger.Whatisthesumofthese24integers?(A)24,000(B)26,664(C)40,440(D)60,000(E)66,660
单选题
LEAGUE RESULTS
Team
Number of Games Won
A
4
B
7
C
9
D
2
E
2
X
According to the incomplete table above, if each of the 6 teams in the league played each of the other teams exactly twice and there were no ties, how many games did team X win? (Only 2 teams play in a game.)
单选题分析总体内部构成上的差异不仅可用圆形图，还可以选用( )。 A．箱线图 B．折线图 C．直方图 D．条形图
单选题先将总体各单位按主要标志分组，再从各组中随机抽取一定单位组成样本，这种抽样形式被称为( )。 A．简单随机抽样 B．等距抽样 C．类型抽样 D．整群抽样
单选题If X and Y are sets of integers, X△Y denotes the set of integers that belong to set X or set Y, but not both. If X consists of 10 integers, Y consists of 18 integers，and 6 of the integers are in both X and Y, then X△Y consists of how many integers?
单选题Politician: Pundits claim that by voting for candidates who promise to cut taxes, people show that they want the government to provide fewer services than it has been providing. By that reasoning, however, people who drink too much alcohol at a party in the evening want a headache the next morning.
Which of the following could replace the statement about people who drink too much without undermining the force of the politician"s argument?
单选题在方差分析中，如果认为不同水平之间不存在显著性差异，则 A．组间方差中仅包含随机误差 B．组间方差中仅包含系统误差 C．组间方差中包含随机误差和系统误差 D．组间方差中不包含随机误差和系统误差
单选题A jewelry dealer initially offered a bracelet for sale at an asking price that would give a profit to the dealer of 40 percent of the original cost. What was the original cost of the bracelet? (1)After reducing this asking price by 10 percent, the jewelry dealer sold the bracelet at a profit of $403. (2)The Jewelry dealer sold the bracelet for $1,953. (A) 条件(1)充分，但条件(2)不充分． (B) 条件(2)充分，但条件(1)不充分． (C) 条件(1)和(2)单独都不充分，但条件(1)和条件(2)联合起来充分． (D) 条件(1)充分，条件(2)也充分． (E) 条件(1)和条件(2)单独都不充分，条件(1)和条件(2)联合起来也不充分．
单选题有一个学生考试成绩为70分，在统计分组中，这个变量值应归入( )。 A．60～70分这一组 B．70～80分这一组 C．60～70分或70～80分两组都可以 D．作为上限的那一组
单选题对一批商品进行质量检验，最适宜采用的调查方式是( )。 A．重点调查 B．抽样调查 C．典型调查 D．非全面统计报表
单选题宝洁公司在洗衣粉上使用“汰渍”、“cheers”等多个品牌，同样，在洗发水上使用“潘婷”、 “海飞丝”、“飘”等品牌。宝洁采用的是：
单选题Thefigureaboverepresentsthefloorplanofanartgallerythathasalobbyand18rooms.IfLisagoesfromthelobbyintoroomAatthesametimethatPaulgoesfromthe10bbyintoroomRandeachgoesthroughalloftheroomsinsuccession,enteringbyonedoorandexitingbytheother,whichroomwilltheybeinatthesametime?(1)Lisaspends2xminutesineachroomandPaulspends3xminutesineachroom.(2)Lisaspends10minuteslesstimeineachroomthanPauldoes.
单选题IftheratioofmentowomenemployedbyCompanySin1975was,whatistheratioofmentowomenemployedbyCompanySin1976?(1)CompanySemployed20morewomenin1976thanin1975.(2)CompanySemployed20moremenin1976thanin1975.
单选题在什么条件下，简单算术平均数和加权算术平均数计算结果相同( )。 A．权数不等 B．权数相等 C．变量值相同 D．变量值不同
单选题根据消费者对品牌的忠诚程度细分市场，这被称为（）
单选题衡量企业经济效益大小和经营获利稳定性的基本标志是( )。 A．其他业务收入 B．营业收入 C．营业利润 D．其他业务利润
单选题On a certain 10-question test, each question after the first question is worth 2 points more than the previous question. If the greatest number of points that can be scored on the test is 100, how many points is the eighth question worth?
单选题How many positive prime numbers are less than the integer n? (1)14＜n＜20 (2)13＜n＜17
单选题下列内容中属于商品购进总额的是( )。 A．从工农业生产者处购进的商品 B．为了本单位自身经营，不为专卖而购进的商品 C．销货退回和买方拒付货款的商品 D．从对外贸易部门和其他单位购进的进口商品
单选题按反映的时间状况不同，总量指标又可分为( )。 A．时间指标和时点指标 B．时点指标和时期指标 C．时期指标和时间指标 D．实物指标和价值指标
单选题某机床厂自动机床的产量和产值这两个变量( )。 A．均为离散变量 B．均为连续变量 C．前者为连续变量，后者为离散变量 D．前者为离散变量，后者为连续变量
单选题A digital wristwatch was set accurately at 8:30 a.m. and then lost 2 seconds every 5 minutes. What time was indicated on the watch at 6:30 p.m. of the same day if the watch operated continuously until that time?
单选题Among the more effective kinds of publicity that publishers can get for a new book is to have excerpts of it published in a high-circulation magazine soon before the book is published. The benefits of such excerption include not only a sure increase in sales but also a fee paid by the magazine to the book"s publisher.
Which of the following conclusions is best supported by the information above?
单选题比较不同水平的总体的标志变动度，需要计算( )。 A．平均差 B．标准差 C．标准差系数 D．全距
单选题Is a+b+C+d equal to 4? (1)a, b, c, and d are each positive. (2)The product abcd equals 1. (A) 条件(1)充分，但条件(2)不充分． (B) 条件(2)充分，但条件(1)不充分． (C) 条件(1)和(2)单独都不充分，但条件(1)和条件(2)联合起来充分． (D) 条件(1)充分，条件(2)也充分． (E) 条件(1)和条件(2)单独都不充分，条件(1)和条件(2)联合起来也不充分．
单选题
经营者提供商品或服务，应向消费者出具购货凭证或服务单据；消费者索要购货凭证或服务单据的，经营者（ ）出具。
A、必须 B、不一定 C、可以 D、视具体情况
单选题下列指标属于比例相对指标的是( )。 A．工人出勤率 B．净产值占总产值的比重 C．积累与消费的比例关系 D．产品合格率
单选题Last week a production worker had gross earnings of $390.00. If she worked more than 40 hours last week and was paid 1.5 times her regular hourly rate for each hour worked in excess of 40 hours, how many hours did she work last week? (1)If she had worked 4 more hours last week, her gross earnings would have been $435.00. (2)Her regular hourly rate last week was $7.50. (A) 条件(1)充分，但条件(2)不充分． (B) 条件(2)充分，但条件(1)不充分． (C) 条件(1)和(2)单独都不充分，但条件(1)和条件(2)联合起来充分． (D) 条件(1)充分，条件(2)也充分． (E) 条件(1)和条件(2)单独都不充分，条件(1)和条件(2)联合起来也不充分．
单选题Kim bought a total of $2.65 worth of postage stamps in four denominations. If she bought an equal number of 5-cent and 25-cent stamps and twice as many 10-cent stamps as 5-cent stamps, what is the least number of 1-cent stamps she could have bought? (A) 5 (B) 10 (C) 15 (D) 20 (E) 25
单选题How does a building contractor most readily prove compliance with the building codes governing new construction? By using those established technologies that the authors of the codes had in mind when setting specifications. This, unfortunately, means that there will never be any significant technological innovation within the industry.
Which of the following, if true, casts the most serious doubt on the conclusion above?
单选题An even number x divided by 7 give some quotient plus a remainder of 6. Which of the following, when added to x, gives a sum which must be divisible by 14?
单选题
单选题
单选题In a retail store, the average (arithmetic mean) sale for month M was d dollars. Was the average (arithmetic mean) sale for month J at least 20 percent higher than that for month M? (1)For month M, total revenue from sales was $3,500. (2)For month J, total revenue from sales was $6, 000.
单选题财务指标中一般运用的价格是( )。 A．历史价格 B．现行价格 C．未来估价 D．变现价格
单选题
单选题Pam and Ed are in a line to purchase tickets. How many people are in the line?
(1)There are 20 people behind Pare and 30 people in front of Ed.
(2)There are 5 people between Pam and Ed.
单选题 The following data sufficiency problems consist of
a question and two statements, labeled (1) and (2), in which certain data are
given.You have to decide whether the data given in the statements are
sufficient for answering the question. Using the data given in the
statements plus your knowledge of mathematics and everyday facts (such
as the number of days in July or the meaning of counterclockwise), you must
indicate whether Ａ. Statement (1) ALONE is sufficient, but
statement (2) alone is not sufficient. Ｂ. Statement (2) ALONE
is sufficient, but statement (1) alone is not sufficient. Ｃ.
BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is
sufficient. Ｄ. EACH statement ALONE is
sufficient. Ｅ. Statements (1) and (2) TOGETHER are NOT
sufficient.
单选题等级相关系数的取值范围是( )。 A．0≤rs≤1 B．rs≤0 C．-1≤rs≤1 D．不定
单选题混合并购的主要优点不包括：
单选题What is the perimeter of △PQR? (1)The measures of ∠PQR, ∠QRP, and ∠RPQ are x°, 2x°, and 3x°, respectively. (2)The altitude of △PQR from Q to PR is 4.
单选题If x and y are positive integers and x is a multiple of y，is y=2? (1)y≠1 (2)x+2 is a multiple of y. (A) 条件(1)充分，但条件(2)不充分． (B) 条件(2)充分，但条件(1)不充分． (C) 条件(1)和(2)单独都不充分，但条件(1)和条件(2)联合起来充分． (D) 条件(1)充分，条件(2)也充分． (E) 条件(1)和条件(2)单独都不充分，条件(1)和条件(2)联合起来也不充分．
单选题用标准差比较分析两个同类总体平均指标的代表性的前提条件是( )。 A．两个总体的标准差应相等 B．两个总体的平均数应相等 C．两个总体的单位数应相等 D．两个总体的离差之和应相等
单选题下列( )说明花费一定的销售成本所创造的净收益。 A．销售利润率 B．成本利润率 C．产值利润率 D．人均利润
单选题A jewelry dealer initially offered a bracelet for sale at an asking price that would give a profit to the dealer of 40 percent of the original cost. What was the original cost of the bracelet?
(1)After reducing this asking price by 10 percent, the jewelry dealer sold the bracelet at a profit of $403.
(2)The Jewelry dealer sold the bracelet for $1,953.
单选题在抽样设计中，最好的方案是( )。 A．抽样误差最小的方案 B．抽样单位最小的方案 C．调查费用最少的方案 D．在一定误差要求下费用最小的方案
单选题Intherectangularcoordinatesystemabove,theshadedregionisboundedbystraightlines.WhichofthefollowingisNOTanequationofoneoftheboundarylines?
单选题产品合格率，设备利用率这两个相对数是( )。 A．前者是结构相对数，后者是比例相对数 B．都是强度相对数 C．都是结构相对数 D．前者是比较相对数，后者是结构相对数
单选题Medieval Arabs had manuscripts of many ancient Greek texts, which were translated into Arabic when there was a demand for them. Medieval Arab philosophers were very interested in Aristotle"s Poetics, an interest that evidently was not shared by medieval Arab poets, because a poet interested in the Poetics would certainly have wanted to read Homer, to whose epics Aristotle frequently refers. But Homer was not translated into Arabic until modern times.
Which one of the following, if true, most strongly supports the argument above?
单选题11．统计测定必须遵循的两个重要原则是( )。 A．实用与科学 B．科学与合理 C．互补与无穷 D．互斥与穷尽
单选题Thetableaboveshowsthecost,indollars,oftravelingtoandfromcitiesA,B,C,D,E,andF.AsalesrepresentativewantstoleavefromA,traveltoC,E,andF,andreturntoA.IfthefirstcitythatthesalesrepresentativetravelstomustbeE，whatistheminimumpossiblecostfortheentiretrip?
单选题企业通过在新地区或国外增设新的商业网点或利用新的分销渠道，加大广告促销 力度等措施，在新市场上扩大现有产品销售，称为：( )
单选题回归系数是 A．自变量和因变量之间关系的强度 B．自变量每变动一个单位时，因变量的平均变动值 C．因变量每变动一个单位时，自变量的平均变动值 D．变量之间的线性关系
单选题During a 3-year period, the profits of Company X changed by what percent from the second year to the third year? (1)The increase in profits of Company X from the first year to the second year was the same as the increase from the first year to the third year. (2)For Company X, the profits for the first year were $13,800 and the profits for the third year were $15,900. (A) 条件(1)充分，但条件(2)不充分． (B) 条件(2)充分，但条件(1)不充分． (C) 条件(1)和(2)单独都不充分，但条件(1)和条件(2)联合起来充分． (D) 条件(1)充分，条件(2)也充分． (E) 条件(1)和条件(2)单独都不充分，条件(1)和条件(2)联合起来也不充分．
单选题房地产市场运行的核心是( )。 A．价格 B．市场 C．供求 D．需求
单选题If k and n are integers, is n divisible by 7? (1)n-3=2k (2)2k-4 is divisible by 7.
单选题发展速度属于( )。 A．比例相对数 B．比较相对数 C．动态相对数 D．强度相对数
单选题已知某工厂生产3种产品，在掌握其基期、报告期生产费用和个体产量指数时，编制3种产品产量总指数应采用( )。 A．加权调和平均数指数 B．加权算术平均数指数 C．数量指标综合指数 D．固定加权算术平均数指数
单选题下列各项因素引起的风险属于系统性风险的是( )。
单选题Questionsrefertothefollowinggraphs.SALESANDEARNINGSOFCOMPANYX
单选题Recent audits revealed that BanqueCard, a credit service, has erred in calculating the interest it charges its clients. But BanqueCard"s chief accountant reasoned that the profits that the company shows would remain unaffected by a revision of its clients" credit statements to correct its previous billing errors, since just as many clients had been overcharged as undercharged.
Which of the following is a reasoning error that the accountant makes in concluding that correcting its clients" statements would leave BanqueCard"s profits unaffected?
单选题3x2+bx+c=0(c≠0)的两个根为α、β，如果α+β，β为根的一元二次方程是 3x2-bx+c=0，则b和c分别为( )．
单选题A study of the difference in earnings between men and women in the country of Naota found that the average annual earnings of women who are employed full time is 80 percent of the average annual earnings of men who are employed full time. However, other research consistently shows that, in Naota, the average annual earnings of all employed women is 65 percent of the average annual earnings of all employed men.
Which one of the following, if also established by research, most helps explain the apparent discrepancy between the research results described above?
单选题Census data for Prenland show that unmarried Prenlandic men in their thirties outnumber unmarried Prenlandic women in that age group by about ten to one. Most of these men do wish to marry. Clearly, however, unless many of them marry women who are not Prenlandic, all but a minority will remain unmarried.
The argument makes which of the following assumptions?
单选题At a certain university, if 50 percent of the people who inquire about admission policies actually submit applications for admission, what percent of those who submit applications for admission enroll in classes at the university? (1)Fifteen percent of those who submit applications for admission are accepted at the university. (2)Eighty percent of those who are accepted send a deposit to the university. (A) 条件(1)充分，但条件(2)不充分． (B) 条件(2)充分，但条件(1)不充分． (C) 条件(1)和(2)单独都不充分，但条件(1)和条件(2)联合起来充分． (D) 条件(1)充分，条件(2)也充分． (E) 条件(1)和条件(2)单独都不充分，条件(1)和条件(2)联合起来也不充分．
单选题Eachstepofastaircaseis0.25meterwideand0.20meterhigh,asshowninthefigureabove.Allanglesshowninthefigurearerightangles.Iftheheightofthestaircaseis3.6metersandthelandingatthetopofthestaircaseis1meterwide,howlong,inmeters,isAB?
单选题若两个相互独立的随机变量X和Y的标准差分别为6与8，则(X+Y)的标准差为( )。 A．7 B．10 C．14 D．无法计算
单选题If 75 percent of a class answered the first question on a certain test correctly, 55 percent answered the second question on the test correctly, and 20 percent answered neither of the questions correctly, what percent answered both correctly? (A) 10% (B) 20% (C) 30% (D) 50% (E) 65%
单选题Onthedayoftheperformanceofacertainplay,eachticketthatregularlysellsforlessthan$10,00issoldforhalfpriceplus$0.50,andeachticketthatregularlysellsfor$10.00ormoreissoldforhalfpriceplus$1.00.Onthedayoftheperformance,apersonpurchasesatotalofytickets,ofwhichxregularlysellfor$9.00eachandtherestregularlysellfor$12.00each.Whatistheamountpaid,indollars,fortheytickets?(A)7y-2x(B)12x-7y(D)7y+4x(E)7y+5x
单选题A 20 percent decline in lobster catches in Maine waters since 1980 can be justifiably blamed on legislation passed in 1972 to protect harbor seals. Maine"s population of harbor seals is now double the level existing before protection was initiated, and these seals are known to eat both fish and lobsters.
Which of the following, if tree, would most seriously weaken the argument above?
单选题5．若所要调查的各个单位没有很明显的差异，则不适合采用( )方式。 A．普查 B_重点调查 C．统计报表制度 D．抽样调查
单选题Theoperation*isdefinedasfollows：.Whatisthevalueof(6)*(4)?
单选题Two children, Bob and Mary, have piggy banks into which they deposit money earned from doing odd jobs. In a certain year, both Bob and Mary each deposited $5 on the first of every month into their respective piggy banks. If these were the only deposits made into the piggy banks during the year, on December 31 does Bob have more money in his piggy bank than Mary has in her piggy bank? (Assume no withdrawals) (1)On March 15 Bob had three times as much money in his piggy bank as Mary had in hers. (2)On June 15 Bob had twice as much money in his piggy bank as Mary had in hers.
单选题Inthefigureabove,DA=DB=DC,whatisthevalueofx?
单选题同一总体不同时间上的同类指标对比的结果是( )。 A．动态相对指标 B．比较相对指标 C．强度相对指标 D．比例相对指标
单选题One-fifthofthelightswitchesproducedbyacertainfactoryaredefective.Four-fifthsofthedefectiveswitchesarerejectedandofthenondefectiveswitchesarerejectedbymistake.Ifalltheswitchesnotrejectedaresold,whatpercentoftheswitchessoldbythefactoryaredefective?(A)4%(B)5%(C)6.25%(D)11%(E)16%
单选题两变量x与y的相关系数为0.8，则其回归直线的判定系数为( )。 A．0.50 B．0.80 C．0.64 D．0.90
单选题Acertainbasketballteamthathasplayedofitsgameshasarecordof17winsand3losses.Whatisthegreatestnumberoftheremaininggamesthattheteamcanloseandstillwinatleasofallofitsgames?(A)7(B)6(C)5(D)4(E)3
单选题统计分组后应使( )。 A．组内同质，组间差异 B．组内差异，组间差异 C．组内同质，组间同质 D．组内差异，组间同质
单选题Are all of the numbers in a certain list of 15 numbers equal? (1)The sum of all of the numbers in the list is 60. (2)The sum of any 3 numbers in the list is 12。
单选题当统计表中某项没有数值时( )。 A．用符号“—”表示 B．用符号“…”表示 C．不需要填写 D．用符号“×”表示
单选题Inthefigureabove,twosearchlightsS1andS2arelocated10,000feetapart,eachcoversanareaofradius10,000feet,andeachislocated8,000feetfromtherailroadtrack.Tothenearest1,000feet,whatisthetotallengthxoftrackspannedbythesearchlights?
单选题在全国人口普查中( )。 A．男性是品质标志 B．人的年龄是变量 C．人口的平均寿命是数量标志 D．全国的人口是统计指标
单选题How many gallons of water must be mixed with 1 gallon of a 15-percent salt solution to obtain a 10-percent salt solution?
单选题下列标志中，属于数量标志的是( )。 A．学生的年龄 B．学生的性别 C．学生的专业 D．学生的籍贯
单选题
单选题在大多数情况下，不是影响战略计划系统设计的主要因素是：
单选题随机试验所有可能出现的结果，称为( )。 A．样本 B．样本空间 C．基本事件 D．全部事件
单选题把近20年来某国的国内生产总值指标按年份顺序排列起来，形成的时间数列是( )。 A．时期总量的时间数列 B．时点总量的时间数列 C．相对数的时间数列 D．平均数的时间数列
单选题某城市商业银行贷款增加25/%，利率提高20/%，则利息额增加( )。 A．45/% B．50/% C．5/% D．12.5/%
单选题There are between 100 and 110 cards in a collection of cards. If they are counted out 3 at a tie, there are 2 left over, but if they are counted out 4 at a time, there is 1 left over. How many cards are in the collection? (A) 101 (B) 103 (C) 106 (D) 107 (E) 109
单选题在综合指数编制时需确定同度量因素和指数化因素，这两个因素一般( )。 A．都固定在基期 B．都固定在报告期 C．采用基期和报告期的平均 D．一个固定在基期，另一个固定在报告期
单选题Larry saves x dollars per month. Will Larry's total savings one year from now exceed his present savings by at least $500? (Assume that there is no interest.) (1)In 6 months Larry's total savings will be $900. (2)In 3 months Larry's total savings will exceed his present savings by $150.
单选题若因变量是定性变量并用比率表示，适合采用( )。 A．直线回归 B．一元回归 C．多元回归 D．逻辑回归
单选题If x, y and z are non-zero numbers such that 1≥y＞x and xy=z, which of the following cannot be true?
单选题While driving Oil the expressway, did Robin ever exceed the 55-miles-per-hour speed limit? (1)Robin drove 100 miles on the expressway. (2)Robin drove for 2 hours on the expressway. (A) 条件(1)充分，但条件(2)不充分． (B) 条件(2)充分，但条件(1)不充分． (C) 条件(1)和(2)单独都不充分，但条件(1)和条件(2)联合起来充分． (D) 条件(1)充分，条件(2)也充分． (E) 条件(1)和条件(2)单独都不充分，条件(1)和条件(2)联合起来也不充分．
单选题If S is an infinite set of real numbers, is there a number in S that is less than every other number in S? (1)Every number in S is an integer. (2)Every number in S is positive.
单选题在同样条件下，不重复抽样的抽样平均误差与重复抽样的抽样平均误差相比( )。 A．前者大于后者 B．前者小于后者 C．两者相等 D．无法判断
单选题The market value of a certain machine decreased by 30 percent of its purchase price each year. If the machine was purchased in 1982 for its market value of $8,000, what was its market value two years later?
单选题Iftaxifareswere$1.00forthefistmileand$0.20foreachmilethereafter,thenthetaxifarefora3-mileridewas
单选题
甲的下列行为构成侵犯商业秘密（ ）。
A、将自己偶然拾得的乙的设计图纸自己使用
B、将自己偶然拾得的乙的设计图氏有偿提供给丙使用，乙并不知晓
C、经乙的授权使用乙的商业秘密，但自己又自作主张无偿提供给丙使用
D、擅自使用乙的专利技术
单选题During a 3-year period, the profits of Company X changed by what percent from the second year to the third year? (1)The increase in profits of Company X from the first year to the second year was the same as the increase from the first year to the third year. (2)For Company X, the profits for the first year were $13,800 and the profits for the third year were $15,900.
单选题相关系数r的取值范围( )。 A．-∞＜r＜+∞ B．-1≤r≤1 C．-1＜r＜1 D．0≤r≤1
单选题要检验总体是否服从正态分布，可采用的统计检验方法是( )。 A．F检验 B．t检验 C．r2检验 D．正态检验
单选题为了了解某商业企业的期末库存量，调查人员亲自盘点库存，这种方法是( )。 A．大量观察法 B．采访法 C．直接观察法 D．报告法
单选题优先段因为有固定的股利又无到期日，因而优先股利可以看作：
单选题某厂家声称某产品的平均使用寿命不低于2000小时，应该建立： A．双侧假设 B．左侧备择假设 C．右侧备择假设 D．单侧假设
单选题方程|x-|2x+1||-4的根是( )．