水泥的( )性质不合格，需要报废。A．初凝时间 B．终凝时间 C．体积安定性 D．

常用的腹腔穿刺位点不包括（）。

A.麦氏点，脐与髂前上棘连线中、外1∕3交点

B.脐与耻骨联合连线中点上方1.0cm偏右或偏左1.5cm处

C.脐周附近

D.侧卧位，脐水平线与腋前线或腋中线的延长线相交处

E.超声定位点

已知样本数据为9.9，10.3，10，10.1，9.7，则方差为（　　）

A．0

B．0.04

C．0.2

D．0.4

简述在Excel工作表中，输入等差数列数据的过程

低压脉冲法测量死接地故障，波形有何特点？

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

17（）

A.for

B.on

C.with

D.of