先天性髋关节脱位的病理改变主要发生在（）。 A.髋部的肌肉、韧带 B.髋臼、股骨头、

甲公司分立为乙公司、丙公司，分立前与债权人达成书面协议约定由乙公司清偿全部债务，丙公司不承担清偿责任。根据公司法律制度的规定，下列表述中，正确的有（）。

A.该协议无效

B.该协议有效

C.债权人只能请求乙公司承担清偿责任

D.债权人可以请求乙公司、丙公司承担连带责任

下列实验设计中能达到预期目的的是[ ]

A. 将氯化铵和硝酸钾的混合物用溶解、过滤的方法分离 

B. 用碳酸钠溶液区分氯化钠溶液、氯化钡溶液和硝酸钙溶液

C. 将氢气和氧气的混合气体通过灼热的氧化铜除去氢气

D. 将氯化钾和二氧化锰的混合物用溶解、过滤和蒸发的方法分离

溶剂再生塔重沸器的蒸汽流量压力采用（）控制。

A、串级

B、单回路

C、分程

D、比值

轨道衡在安装好后，检定前应做的准备工作有哪些？

There is a difference between science and technology. Science is a method of answering (1) questions; technology is a method of solving practical problems. Science has to do with discovering the facts and relationships between (2) phenomena in nature and with establishing theories that (3) to organize these facts and relationships; technology has to do with tools, techniques, and (3) for applying the findings of science. Another (5) between science and technology has to do with the progress in each.

Progress in science (6) the human factor. Scientists, who seek to understand the universe and know the truth within the highest degree of (7) and certainty, cannot (8) their own or other people’s likes or dislikes or to popular ideas about the fitness of things. What scientists discover may shock or (9) people-as did Darwin’s theory of evolution. But even an unpleasant truth is (10) than likely to be useful; besides, we have the choice of refusing to believe it! But (11) so with technology; we do not have the choice of refusing to hear the sound produced by a supersonic aircraft flying overhead; we cannot refuse to breathe polluted air. (12) science, progress in technology must be measured (13) the human factor. The purpose of technology is to serve people—people (14) , not merely some people; and future generations, not merely those who presently wish to (15) advantage for themselves.

We are all familiar with the (16) use of technology. Many people blame technology itself (17) widespread pollution, resource depletion (枯竭) and even social decay in general—so much (18) the promise of technology is " (19) " That promise is a cleaner and healthier world. If wise applications of science and technology do not (20) a better world, what else will

6（）

A.distracts

B.excludes

C.expels

D.disposes