汽车安全袋中的硝酸铵受到猛烈撞击后产生大量的气体,使气囊迅速鼓起而减轻人身伤害,

题型:选择题

问题:

汽车安全袋中的硝酸铵受到猛烈撞击后产生大量的气体,使气囊迅速鼓起而减轻人身伤害,其发生的反应为:

2NH4NO3

   高温   
.
或撞击
2N2↑+O2↑+4X,则X物质为(  )

A.H2

B.H2O

C.H2O2

D.HNO3

考点:质量守恒定律
题型:选择题

阅读理解 。

  Pubs are an important part of British life. E-ven very small villages always

have one. People,especially men, often go to a pub for a drink in thesame pub.

Women now go to the pubs more thanthey used to, butthey usually don't like to go

to apub on their own. Children under 16 are usuallynot allowed to go to the

pubs.      

  Until 1988, pubs were only open from 12 amto 2 pm. When it's nearly time

for the pub toclose, the owners shout "last orders" and the"time". Pubs also sell

food or snacks, Typical pubfood is pie, chicken and chips, and bread with

cheese.  Pubs have names.  Here is often a sign out-side the pub shoWing the

name with a picture.Many pubs have two or more different bars. Thepublic bar

often has a pool table and

dartboard(飞镖). Local people usually go to such kind of bar.The saloon bar is

comfortable and well-furnished.Men and women often go there drinking

together.                       

1. Who do you think will go to the pubs  more? 

A. Men.        

B. Women.        

C. Villagers.        

D. Children under 16.

2. Do women often go to the pubs alone?

A. Yes, they do.    

B. No, they don’t.  

C. Yes, they will.    

D. No, they didn’t.

3. How long were the pubs usually open before 1988 ?

A. For about 12 hours.    

B. For about 14 hours.    

C. For about 9 hours.

D. For about 2 hours.

4. Which of the following is TRUE? 

A. An eighteen-year-old boy can't go to the pubs.    

B. Women weren't allowed to go to the pubs on their own.    

C. Pubs sell food or snacks,but they don’t sell drinks.    

D. Local people usually like to go to the public bar.

5. What do you think. the public bar is like? 

A. It's more crowded and comfortable.   

B. It's comfortable and clean.    

C. It's more crowded than the saloon bar.

D. The drinks there are more expensive.

题型:选择题

板块学说认为,全球可以大致分成________大板块,我国处于_________________板块。

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家蚕的成虫与幼虫的主要区别是(  )

A.形态结构不同

B.所吃食物不同

C.形态结构和生活习性不同

D.身体大小和生活环境不同

题型:选择题

试述影响和制约工资水平的主要因素。

题型:选择题

需求分析阶段的任务是确定______。

A.软件开发方法

B.软件开发工具

C.软件开发费用

D.软件系统功能

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