单选题在一次运动会上有4项比赛的冠军在甲、乙、丙3人中产生，那么不同的夺冠情况共有______种．A．B．43C．34D．E．

单选题设f(x)有一阶导数且f(0)=1，则

单选题有已知a，b，c是三个正整数，且a＞b＞c，若a，b，c的算术平均值为，几何平均值是4，且b，c之积恰为a，则a，b，c的值依次为()．

单选题质地均匀的骰子六面分别刻有1-6的点数，掷两次骰子，得到向上一面的两个点数，则下列事件中，发生可能性最大的是。

单选题如右图所示，正方形ABCD的面积是25，矩形DCEF中CF=8，则DF的长为()。

单选题This book is written expressly for students in an attempt to present the material that is most useful and interesting to them. Previous courses in chemistry are not necessary for the understanding of the material, although those students who have had high school chemistry will find that a review of the inorganic section will better enable them to master the organic and biochemistry sections that follow. The author has felt that in the past there was an improper selection of material from inorganic, organic, and biochemistry in the majority of the textbooks of chemistry for nurse. The tendency has been to develop the inorganic chemistry to such an extent that organic and biochemistry is covered too briefly. The recent advances in biochemistry and their widespread application to the practice of medicine and nursing have considerably altered the situation. Not only is biochemistry more closely allied to the practical chemistry of medicine and nursing but also it is of more interest to the student. In the author's experience the response to biochemistry has always been more favorable than to the other sections. Within the brief period allotted to chemistry, therefore, the sections on inorganic, organic, and biochemistry should be so arranged that a good share of the time is spent in the study of biochemistry. This book presents mainly those fundamentals of inorganic and organic chemistry that are necessary for the understanding of the section on biochemistry. The fundamental points suggested in the Curriculum Guide are included in the book, with some additions in the biochemistry section. The author feels that a study of urine, vitamins, nutrition, and hormones is so obviously a part of biochemistry that at least the fundamentals should be included in this course. The book has been planned in such a way that it may be adapted to various courses in chemistry. The material suggested by the Curriculum Guide is covered in the first nineteen chapters and may be used in accelerated courses or where minimum time is allotted to chemistry. When the time allotted to the course is sixty to ninety hours, the entire contents of the book may be used to advantage. While the book has been written especially to fit the needs of Schools of Nursing, it could readily be applied in instances where students are required to take but one course in chemistry. The apathetic attitude of nonprofessional students toward a course in inorganic chemistry may well be overcome by the proper presentation of material selected from inorganic, organic, and biochemistry.

单选题设其中f(x)为连续函数，则等于()

单选题设f(0)=0，则f(x)在点x=0可导的充要条件为[]

单选题马克思指出：“在同一时间内，劳动就一种属性来说必然创造价值，就另一种属性来说必然保存或转移价值。”这句话表明______。 A．工人在同一时间内劳动两次，一次由自己的劳动把新价值加到劳动对象上，另一次把消耗掉的生产资料的价值转移到产品上 B．新价值的创造和生产资料原有价值的保存或转移，是同一劳动引起的两种不同结果 C．生产资料价值的保存或转移到产品中去是在劳动过程中发生的 D．土地、设备、原材料等生产要素是生产过程中必不可少的物质要素，它们和劳动结合，共同生产出使用价值

单选题设f(x)在(-∞，+∞。)存在二阶导数，且f(x)=-f(-x)，当x＜0时有f'(x)＜0，f"(x)＞0，则当x＞0时有______。 A．f'(x)＜0，f"(x)＞0 B．f'(x)＞0，f"(x)＜0 C．f'(x)＞0，f"(x)＞0 D．f'(x)＜0，f"(x)＜0

单选题设f(x)=ax 3 -6ax 2 +b在区间[-1，2]上的最大值是3，最小值是-29，且a＞0，则

单选题已知极限，则n=()．A．4B．3C．2D．1

单选题设。则{{U}}{{/U}}．A.曲线f(x)，g(x)均有垂直渐近线B.曲线f(x)，g(x)均无垂直渐近线C.曲线f(x)有垂直渐近线，曲线g(x)无垂直渐近线D.曲线f(x)无垂直渐近线，曲线g(x)有垂直渐近线

单选题如果，则的值为()．

单选题设f(x)为[-1，1]上连续函数，则定积分等于______。A．0B．C．D．

单选题现有六个量杯A，B，C，D，E，F，它们的容积分别是16毫升，18毫升，22毫升，23毫升，24毫升，34毫升．有些量杯中注满了酒精，有些量杯中注满了蒸馏水，还剩下一个空量杯，而酒精的体积是蒸馏水体积的两倍．那么，注满蒸馏水的量杯是______．

单选题函数的值域为{{U}}{{/U}}。

单选题n阶矩阵A具有n个线性无关的特征向量是A与对角矩阵相似的

单选题A．B．C．1D．2E．3

单选题A．B．3C．0D．