将E-R图转换到关系模式时，实体与联系都可以表示成______。A．属性 B．关系

阅读理解。

     I live on the twelfth floor of a building. One afternoon I was coming home from a friend's house. It

was just after four o'clock. I got quickly into the lift and pressed Button (按钮) 12.

     The lift started to go up, but very slowly. And then, half way up, it suddenly stopped between two

floors. I couldn't understand it. I pressed all the buttons from 1 to 14. I called for help very loudly. But

nobody answered.

      Then suddenly the light went out, and I was alone in the dark. I started to cry and beat the walls of

the lift. I cried and cried until I had no voice left. Then, I felt hopeless, and pressed all the buttons with

my open hands. And all at the same time, there was a bell far away. It rang and rang. It was the fire

alarm (火灾警报). I thought the whole building was on fire. I said to God quietly, "Just get me out of

here. I'll never be bad again."

     Just then, I realized the lift was moving very slowly. On the ground floor it stopped, and the doors

opened. A man was standing there. "How long have you been in there? It is good that you pressed the

alarm bell. But haven't you learned to read at your school?" He pointed at a small piece of paper on the

wall beside the lift. It said:

     "Attention: This lift will be stopped for repairs between 4pm and 5 pm on Thursday March 13."

1. What happened to the lift?

A. It had a fire accident.                

B. It stopped half way.  

C. It was turned off by the writer.        

D. It moved fast up to the top floor

2. As the situation went on, the writer became _________.

A. more and more scared              

B. calmer and calmer  

C. more and more bored              

D. clearer and clearer

3. Why did a bell ring from far away?

A. The lift was to start again.          

B. The repair worker rang the lift alarm.

C. The building was on fire.            

D. The writer pressed the lift alarm bell.

4. Who most probably made the lift move again and go down to the ground floor?

A. The writer.        

B. The writer's friend.      

C. The man.    

D. The writer's father.

5. After reading the paper, the writer realized that he/she had _________.

A. escaped a fire accident              

B. made a silly mistake  

C. visited a dishonest friend            

D. pressed a wrong button

用化学用语填空：

（1）氩气____________

（2）n个汞原子______________

（3）6个三氧化硫分子_______________

（4）2个铵根离子___________

（5）氢氧化钙中钙元素为+2价 _______________

容积渗透克分子浓度（）
尿渗透克分子浓度（）
细胞外液（）
血浆渗透克分子浓度（）
重量渗透克分子浓度（）

A.Posm

B.mOsm/kg

C.mOsm/L

D.Uosm

E.ECF

ZXMSG9000设备的OMP板上有（）个CPU，在数据配置分别配置成（）和（）模块，实现不同的功能。

隔离层