（2007）一平面谐波的表达式为y=0.002cos（400πt-20πx）（SI）

阅读理解。

     Jack worked in an office in a small town. One day his boss (老板) said to him,"Jack, I want you to

go to Manchester, to an office there, to see Mr Brown. Here is the address. Jack went to Manchester.

When he walked out of the railway station. he thought. "The office isn't far from the station. I'll find it

easily."    

     But after an hour he didn't find it,so he stopped and asked an old woman. She said, "Go straight

along this street, turn to the left at the end, and it's the second building on the right. " Jack went and

found it.    

     A few days later he went to the same city, but again he couldn't find the office, so he asked someone

on the way. It was the same old woman!  She was surprised and said,"Are you still looking for that

place?"

1. Manchester is the name of  ______.

A. a city         

B. a building

C. a country      

D. a street

2.The boss wanted Jack to ______. 

A. go to Manchester   

B. go to his office

C. look after Mr. Brown  

D. visit Mr. Brown

3. How did Jack go to Manchester?

A. By bus.   

B. By train.   

C. By car.   

D. By plane.

4. Jack left the station and ______.

A. found the office himself  

C. asked where the office was

B. someone told him the way 

D. didn't know where he was

5. From the story we know ______.

A. Jack had a bad memory (记忆力) 

B. it was really difficult to find that place    

C. Jack never went to Manchester 

D. Jack was still looking tor that place    

点法与按法的区别是：（）

A.点法用拇指，按法用手掌

B.点法比按法刺激量小

C.点法比按法作用面积大

D.点法比按法作用面积小，刺激量大

E.点法为屈指，按法为拇指

浮选辅助设备大多是标准设备，浮选机是非标设备。

中国现代弃医从文的作家有（）、（）。

在( )情况下，采暖管道和设备不应进行保温。

A．有可能冻结的过门地沟内的凝结水管和回水管
B．敷设在采暖房间内的设备和管道
C．敷设在地沟内、闷顶或阁楼内时
D．管道的无益热损失较大时