当并联支管的压力损失差超过有关规定时，进行压力平衡的方法不包括（） A.增加支管数量

如图所示装置，有多种功能，下列关于该装置用途的说法正确的是（　　）

A．用排水法收集难溶于水的气体，瓶内装满水，气体从A进入

B．除去一氧化碳中的二氧化碳，瓶内装NaOH溶液，气体从A进入

C．测量难溶于水的气体体积，瓶内装满水，气体从A进入，B后可接量筒

D．用排空气法收集密度小于空气的气体，气体从A进入

小儿慢惊风的针灸治则是

A．豁痰开窍、镇惊息风

B．补益脾肾、镇惊息风

C．补益肝肾、镇惊息风

D．清热祛邪、镇惊息风

X线管容量是指X线管在安全使用条件下能承受的最大负荷量，是一次负荷的安全性。即在确定曝光时间下所能允许使用的最大曝光条件－管电压和管电流。X线机中设置容量保护电路就是为了防止一次性超负荷曝光。X线管的容量（Pa）与管电压的有效值、管电流的有效值成正比。X线管的容量还与设备高压整流方式和曝光时间有关。X线发生时，绝大部分电能转化为热量。

供给X线管的能量，有百分之多少转换成X线（）

A.小于1%

B.4%

C.10%

D.85%

E.99%

造成柴油机爆发压力不足的原因有哪些？如何调整？

阅读理解。

     A new generation addiction is quickly spreading all over the world.Weboholism,a twentieth

century disease,affects people from different ages.They surf the net,use email and speak in chat

rooms.They spend many hours on the computer,and it becomes a compulsive habit.They cannot

stop,and it affects their lives.

     Ten years ago,no one thought that using computers could become compulsive behavior that

could affect the social and physical life of computer users.This obsessional behavior has

affected teenagers and college students.They are likely to log on computers and spend long

hours at different websites.

     They become hooked on computers and gradually their social and school life is affected

by this situation.They spend all free time surfing and don't concentrate on homework,so this

addiction influences their grades and success at school.Because they can find everything on

the websites,they hang out there.Moreover,this addiction to websites influences their social life.   

     They spend more time in front of computers than with their friends.The relation with their

friends changes.The virtual life becomes more important than their real life.They have a new

language that they speak in the chat rooms and it causes cultural changes in society.

     Because of the change in their behavior,they begin to isolate themselves from the society

and live with their virtual friends.They share their emotions and feelings with friends who they

have never met in their life.Although they feel confident on the computer,they are not confident

with real live friends they have known all their life.It is a problem for the future.This addictive

behavior is beginning to affect all the world.

1．The main idea of the passage is about________.

A．the cause of weboholism

B．the advantage of weboholism

C．the popularity of weboholism

D．the influence of weboholism

2．The underlined word“obsessional”in the second paragraph most probably means“________”．

A．attractive      

B．addictive

C．professional              

D．potential

3．We can infer from the passage that________.

A．weboholism has the greatest effect on teenagers

B．students can hardly balance real and virtual life

C．people are addicted to games on the Internet

D．virtual life is more vivid and attractive anyway

4．Which of the following is NOT true of weboholism?

A．It contributes to the development of the web.

B．The chat room language may change social culture.

C．The problem will be getting more and more serious later.

D．People addicted to the web often become inactive in real life.

5．The author's attitude towards weboholism is that of being________.

A．optimistic          

B．positive

C．oppositive          

D．acceptable