用单法兰测量密闭容器的压力时，一般将单法兰的负压端接一导压管至容器的顶端，这主要起什

甲乙两公司均为使用其公司数码产品有疑难问题的顾客提供24小时的热线电话咨询服务。拨打热线电话要收取相应的通话费用，所以通常来说，消费者只有在使用数码产品遇到困难时才会拨打电话。甲公司接到的热线电话数量比乙公司多5倍。这说明，甲公司的数码产品一定比乙公司的复杂又难用。以下各项如果为真，最能支持上述结论的是：

A．乙公司数码产品的消费者数量比甲公司的多2倍

B．甲公司数码产品的消费者数量比乙公司的多5倍

C．乙公司收到的有关数码产品质量问题的投诉比甲公司多2倍

D．甲公司收到的有关数码产品质量问题的投诉比乙公司多5倍

希尔排序属于( )。

A．交换排序

B．归并排序

C．选择排序

D．插入排序

头影测量分析中FMIA是指（）。

A.下中切牙的长轴与SN平面的交角

B.下中切牙的长轴与下颌平面的交角

C.下中切牙的长轴与眼耳平面的交角

D.SN平面与下颌平面的交角

E.眼耳平面与下颌平面的交角

立井井口和井底使用罐座时，必须对罐座设置（），罐座未打开，发不出开车信号。

A.松绳保护

B.闭锁装置

C.连接装置

D.平衡装置

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

9（）

A.anger

B.flare

C.ignite

D.blare