单选题若，则A．B．C．D．E．

单选题几位同学对物理竞赛的名次进行猜测。小钟说：“小华第三，小任第五。”小华说：“小闽第五，小宫第四。”小任说：“小钟第一，小闽第四”。小闽说：“小任第一，小华第二。” 小宫说：“小钟第三，小闽第四。” 已知本次竞赛没有并列名次，并且每个名次都有人猜对。那么，具体名次应该是： A．小华第一、小钟第二、小任第三、小闽第四、小官第五。 B．小闽第一、小任第二、小华第三、小宫第四、小钟第五。 C．小任第一、小华第二、小钟第三、小宫第四、小闽第五。 D．小任第一、小闽第二、小钟第三、小宫第四、小华第五。 E．小任第一、小钟第二、小华第三、小宫第四、小闽第五。

单选题等于()A．B．C．-cotx+sinx+CD．cotx+sinx+C

单选题设f(x)是二阶可导的奇函数，y(x)=f(cosx)·cos[f(x)]，且当时，f(x0)=x0，f"(0)=f"(x0)=1，则y"(x0)=______

单选题()A．0B．1C．eD．-∞

单选题当x取()时，等式恒成立．

单选题打印一页文件，甲出错的概率为0.04，乙出错的概率为0.05，从两人打印的文件中各取一页，则其中恰有一页有错的概率为()．

单选题级数(a为大于0的常数)()．A．绝对收敛B．条件收敛C．发散D．收敛性与a有关

单选题48支足球队，等分为8组进行初赛，每组中的各队之间都要比赛一场，初赛中比赛的总场数是[ ]

单选题已知E(X)=1，E(X)2=3，用切比雪夫不等式估计则a的最大值为()

单选题从正方体的6个面中选取3个面，其中有2个面不相邻的选法共有( )种．

单选题设则f(x)的定义域是______．

单选题某公司员工义务献血，在体检合格的人中，O型血的有10人，A型血的有5人，B型血的有8人，AB型血的有3人．若从四种血型的人中各选1人去献血，则不同的选法种数共有( )。

单选题If there is one thing scientists have to hear, it is that the game is over. Raised on the belief of an endless voyage of discovery, they recoil from the suggestion that most of the best things have already been located. If they have, today's scientists can hope to contribute no more than a few grace notes to the symphony of science. A book to be published in Britain this week, The End of Science, argues persuasively that this is the case. Its author, John Horgan, is a senior writer for Scientific American magazine, who has interviewed many of today's leading scientists and science philosophers. The shock of realizing that science might be over came to him, he says, when he was talking to Oxford mathematician and physicist Sir Roger Penrose. The End of Science provoked a wave of denunciation in the United States last year. "The reaction has been one of complete shock and disbelief, "Mr. Horgan says. The real question is whether any remaining unsolved problems, of which there are plenty, lend themselves to universal solutions. If they do not, then the focus of scientific discovery is already narrowing. Since the triumphs of the 1960s—the genetic code, plate tectonics, and the microwave background radiation that went a long way towards proving the Big Bang—genuine scientific revolutions have been scarce. More scientists are now alive, spending more money on research, that ever. Yet most of the great discoveries of the 19th and 20th centuries were made before the appearance of state sponsorship, when the scientific enterprise was a fraction of its present size. Were the scientists who made these discoveries brighter than today's? That seems unlikely. A far more reasonable explanation is that fundamental science has already entered a period of diminished returns. "Look, don't get me wrong," says Mr Horgan. "There are lots of important things still to study, and applied science and engineering can go on for ever. I hope we get a cure for cancer, and for mental disease, though there are few real signs of progress./

单选题函数(x＞1)的最小值为()．

单选题设随机变量X～F(m，n)，令P{X＞Fα(m，n)}=α(0＜α＜1)，若P(X＜k)=α，则k等于______．A．Fα(m，n)B．F1-α(m，n)C．D．

单选题下列命题正确的是( )A．无穷小量的倒数是无穷大量B．无穷小量是绝对值很小很小的数C．无穷小量是以零为极限的变量D．无界变量一定是无穷大量

单选题某人手中握有一把玉米粒，若3粒一组取出，余1粒；若5粒一组取出，也余1粒；若6粒一组取出，也余1粒，则这把玉米粒最少有______粒．

单选题曲线y=xlnx在点（e，e）处法线的斜率为

单选题下列不等式中成立的是{{U}} {{/U}}。 A.sin1＜sin4 B.cos1＜cos4 C.tan1＜tan4 D.cot1＜cot4