单选题设离散型随机变量X的分布列为 X -1 0 1 P 5c 2c 0.3 则c=______

单选题设f(x)在x=x0的某邻域内有定义，在x=x0的某去心邻域内可导．下述论断正确的是[]

单选题若abc=1，那么

单选题对厦门大学计算机系100名学生进行调查，结果发现他们喜欢看NBA和足球、赛车。其中58人喜欢看NBA，38人喜欢看赛车，52人喜欢看足球，既喜欢看NBA又喜欢看赛车的有18人，既喜欢看足球又喜欢看赛车的有16人，三种都喜欢看的有12人，则只喜欢看足球的有______

单选题当x→0+时，与等价的无穷小量是______．A．B．C．D．

单选题某机床厂10月份生产机床1000台，这样全年生产计划在10月底就完成了，若年底前再生产2310台，将完成全年计划的121%，则11月份和12月份的平均增长率是( )． (A)10% (B)11% (C)9% (D)21% (E)19%

单选题直线所得的劣弧所对的圆心角为（　）

单选题设A，B均是n阶实对称可逆矩阵，则存在可逆矩阵P，使得下列关系式成立的个数是______ ①PA=B； ②P -1 ABP=BA； ③P -1 AP=B； ④P T A 2 P=B 2 ．

单选题设在点x=1处连续，则a等于{{U}}{{/U}}．A.-1B.0C.1D.2

单选题The majority of successful senior managers do not closely follow the classical rational model of first clarifying goals, assessing the problem, formulating options, estimating likelihoods of success, making a decision, and only then taking action to implement the decision. Rather, in their day-by-day tactical maneuvers, these senior executives rely on what is vaguely termed " intuition " to manage a network of interrelated problems that require them to deal with ambiguity, inconsistency, novelty, and surprise; and to integrate action into the process to thinking. Generations of writers on management have recognized that some practicing managers rely heavily on intuition. In general, however, such writers display a poor grasp of what intuition is. Some see it as the opposite of rationality; others view it as an excuse for capriciousness. Isenberg's recent research on the cognitive processes of senior managers reveals that managers' intuition is neither of these. Rather, senior managers use intuition in at least five distinct ways. First, they intuitively sense when a problem exists. Second, managers rely on intuition to perform well-learned behavior patterns rapidly. This intuition is not arbitrary or irrational, but is based on years of painstaking practice and hands-on experience that build skills. A third function of intuition is to synthesize isolated bits of data and practice into an integrated picture, often in an " Aha! " experience. Fourth, some managers use intuition as a check on the results of more rational analysis. Most senior executives are familiar with the formal decision analysis models and tools, and those who use such systematic methods for reaching decisions are occasionally leery of solutions suggested by these methods which run counter to their sense of the correct course of action Finally, managers can use intuition to bypass in-depth analysis and move rapidly to engender a plausible solution. Used in this way, intuition is an almost instantaneous cognitive process in which a manager recognizes familiar patterns. One of the implications of the intuitive style of executive management is that " thinking " is inseparable from acting. Since managers often " know " what is right before they can analyze and explain it, they frequently act first and explain later. Analysis is inextricably tied to action in thinking/acting cycles, in which managers develop thoughts about their companies and organizations not by analyzing a problematic situation and then acting, but by acting and analyzing in close concert. Given the great uncertainty ofmany of the management issues that they face, senior managers often instigate a course of action simply to learn more about an issue They then use the results of the action to develop a more complete understanding of the issue. One implication of thinking/acting cycles is that action is often part of defining the problem, not just of implementing the solution.

单选题下列极限中正确的是（ ）

单选题已知α=(1，3，2)T，β=(1，-1，-2)T，又A=E-αβT，k是非0常数，则矩阵A的最大特征值所对应的特征向量是

单选题过点(1，0)作曲线y=x2的两条切线，它们与曲线y=x2所围图形的面积是( )．

单选题交错级数的和S=A．．B．．C．．D．．

单选题After the terrorist attacks in America last September, terrorist risk became the pariah of perils. The airline industry was most directly affected by the attacks, and it was the first to find that no one wanted to insure terrorist risk. Insurance companies immediately increased premiums and cut cover for airlines' third-party terror and war liabilities to $ 50m per airline, per "event". Under pressure from airlines, the American government and the members of the European Union agreed to become insurers of last resort for airlines' war and terrorist liabilities, for a limited period. These government guarantees are due to expire at the end of the month. The American government has already agreed to extend its guarantee for another 60 days. The EU's transport ministers are meeting next week in Brussels to decide what to do. Insurers and reinsurers are keen for the commercial market to resume the provision of all airline insurance as soon as possible. No wonder: The premiums for such cover have inevitably increased considerably. However, in the case of terrorism, and especially of terrorism in the skies, a number of special factors arise. Some are purely practical: a disaster as sudden and unforeseen as the attacks on the World Trade Center has had destructive effects on the insurance industry. The maximum cover for third-party terrorist risk available in the primary aviation market is now $ 50m, and that is not nearly enough cover risks that are perceived to be much higher since September 11th. Even if the market could offer sufficient cover, another catastrophe on such a scale would be more than the market could cope with. In addition, a rare and devastating risk of a political nature is arguably one that it is right for governments to cover, at least in part. In the wake of attacks by Irish terrorists the British government has recognized this point by agreeing to back a mutual fund to cover risks to property from terrorist attack. In the case of the airlines, the appropriate answer is some form of mutual scheme with government backing. In fact, under the code-name "Equitime", representatives of airlines, insurers and the American government are setting up an insurance vehicle to be financed by airlines and reinsured by the government. Governments would guarantee the fund's excess. risk, but their role would diminish as the fund grew. Setting something up will take time. So, to bridge the gap, governments will have to remain insurer of last resort for airlines' war and terrorist risk for some time to come.

单选题设f(x)在x=a处可导，且f(a)≠0，则|f(x)|在x=a处______．

单选题已知函数y=f(x)的图像与函数y=2x+1的图像关于直线x=2对称，则f(x)=______。

单选题函数y=cos3(5x+2)的复合过程是______ A.y=cos3u，u=5x+2 B.y=u3，u=cos(5x+2) C.y=u3，u=cosv，v=5x+2 D.y=cosu3，u=5x+2