题目内容

天然药物是指动物药、植物药、矿物药等天然资源加工而成的药物，批准文号为：（）

A. 国药准字H+8位数字
B. 国药准字Z+8位数字
C. 国药准字S+8位数字
D. 国药准字F+8位数字

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定积分换元时要换上下限。

A. 对
B. 错

关于静力学中约束的概念，以下表述错误的是

A. 约束反力、约束力和反力是同一个概念；
B. 习惯上把构成约束条件的周围物体称为约束；
C. 约束力的大小和方向只与作用于非自由体的主动力有关；
D. 主动力是指那些能够使物体产生运动或运动趋势的力。

三力平衡定理是

A. 刚体受不共面三个力作用时也可能平衡。
B. 三力汇交于一点，则这三个力必互相平衡
C. 共面不平行的三个力互相平衡必汇交于一点。
D. 共面三力若平衡，必汇交于一点

This is the VOA Special English Education Report.1.What is the difference between a college and a university? This is the ___ of part three in our series for students who want to a college or university in the United States.[音频]2.Colleges and universities have many things in _. Both provide a greater ____ of the world and its past. Both provide education in the arts and sciences. And both can help prepare young people to .[音频]3.Students who complete their _ studies either at a for-year college or a university receive degree. One difference is that many colleges do not offer graduate studies.[音频]4.Universities are generally bigger, offer more and do more research. Modern universities developed from those of the in Europe. The word “university” came from the Latin “universities.” This described a group of people __ for a common purpose.[音频]