单选题已知级数分别收敛于a，b，则级数______。A．不一定收敛B．必收敛，和为2a+bC．必收敛，和为a-2bD．必收敛，和为a+2b

单选题设，那么f(n+1)-f(n)=()。A．B．C．D．

单选题设矩阵若集合Ω={1，2}，则线性方程组Ax=b有无穷多解的充分必要条件为A．B．C．D．a∈Ω，d∈Ω．

单选题设向量组α 1 ，α 2 ，α 3 ，α 4 线性相关，则下列向量组中线性无关的是______

单选题一条长为1200米的道路的一边每隔30米立一根电线杆，另一边每隔25米栽一棵树，如果在马路人口与出口处刚好同时有电线杆与树相对而立，那么整条道路上两边同时有电线杆与树相对而立的地方共有( )处．

单选题设随机变量X和Y相互独立，都服从[0，b]上均匀分布，则E[min(X，Y)]=______A．B．b．C．D．

单选题The Republican Party has lost its mind. To win elections, a party needs votes, obviously, and constituencies. First, however, it needs ideas. In 1994--95, the Republican Party had after long struggle advanced a coherent, compelling set of political ideas expressed in a specific legislative agenda. The political story of 1996 is that this same party, within the space of six weeks, then became totally, shockingly intellectually deranged. Then, astonishingly, on the very moment of their philosophical victory, just as the Republicans prepared to carry these ideas into battle in November, came cannon fire from the rear. Pat Buchanan first came out to declare a general insurrection. The enemy, according to Buchanan, is not the welfare state. It is that conservative icon, capitalism, with its ruthless captains of industry, greedy financiers and political elites (Republicans included, of course). All three groups collaborate to let foreigners--immigrants, traders, parasitic foreign-aid loafers--destroy the good life of the ordinary American worker. Buchananism would support and wield a big and mighty government apparatus to protect the little guy from buffeting, a government that builds trade walls and immigrant-repelling fences, that imposes punitive taxes on imports, and that polices the hiring and firing practices of business with the arrogance of the most zealous forcer. Republicans have focused too much on the mere tactical dangers posed by this assault. Yes, it gives ammunition to the Democrats. Yes, it puts the eventual nominee through a bruising campaign and delivers him tarnished and drained into the ring against Bill Clinton. But the real danger is philosophical, not tactical. It is axioms, not just policies, that are under fire. The Republican idea of smaller government is being ground to dust--by Republicans. In the middle of an election year, when they should be honing their themes against Democratic liberalism, Buchanan's rise is forcing a pointless rearguard battle against a philosophical corpse, the obsolete paleoconservatism--a mix of nativism, protectionism and isolationism--of the 1930s. As the candidates' debate in Arizona last week showed, the entire primary campaign will be fought on Buchanan's grounds, fending off his Smoot-Hawley-Franco populism. And then what? After the convention, what does the nominee do? Try to resurrect the anti-welfare state themes of the historically successful '94 congressional campaign? Political parties can survive bruising primary battles. They cannot survive ideological meltdown. Dole and Buchanan say they are fighting for the heart and soul of the Republican Party. Heart and soul, however, will get you nowhere when you've lost your way--and your mind.

单选题∫(x-1)3dx=______．A．B．(x-1)4+CC．4(x-1)2+CD．3(x-1)2+C

单选题在四边形ABCD中，设AB的长为8，∠A:∠B:∠C:∠D=3:7:4:10，∠CDB=60°，则△ABD的面积是______．

单选题甲花费10万元购买了“创业板”股票，随后他将这些股票转卖给乙，获利10%；不久乙又将这些股票返卖给甲，但乙损失了10%；最后甲按乙卖给他的价格的9折把这些股票卖掉了．若不计交易费，则甲在上述股票交易中______．

单选题中共八大提出的我国当时经济建设的指导方针是______。 A．调动一切积极因素，建设社会主义强国 B．既反保守又反冒进，在综合平衡中稳步前进 C．在新的生产关系下保护和发展生产力 D．把我国尽快地由农业国变为先进的工业国

单选题设，且f"(0)存在，则( )

单选题下列计算正确的是()．(E)A、B、C、D都不正确

单选题设函数f(x)=在x=0处连续，则a=()

单选题一个角为30°的直角三角形的短的直角边长为a，求它的内切圆的半径．

单选题下列矩阵中，A和B相似的是______A．B．C．D．

单选题设f(x)为连续函数，则(∫f5x)dx)"等于____．

单选题设a，b是实数，则下列结论中正确的是( )．

单选题设随机变量X～U[-1，1]，则随机变量U=arcsinX，V=arccosX的相关系数为______．A．-1B．0C．D．1

单选题在x趋向于______时，为无穷小量。