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压缩机的润滑有何作用？

答案

参考答案：

压缩机的润滑作用主要是减少摩擦部件的磨损和消耗的摩擦功，此外还能冷却运动机构的摩擦表面、密封活塞以及填料函、从而提高活塞和填料函的工作可靠性。

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    Today people can use the phone to talk with others almost anywhere on the earth. But    1   you use the
phone, you can't see the person you are talking with. That   2   change in the future.
Now some people are using a kind of telephone called the picture phone or a vision phone (视频电话). Two
people   3   are talking can see each other with it.
    Picture phones can be useful when you have   4   to show the person you are calling. They may have other
uses in the future. One day you may be able to ring up a   5   and ask to see a book. Then you'll be able to   6   
the book over your picture phone. Also you may be able to do shopping through your picture phone. If you
see something   7   the newspaper that you want to buy, you can   8   the shop. People at the shop will show
you the thing you're   9   in over the phone. You'll be able to shop all over the town and never even leave your
room.
    The picture phone is really a  10  phone. More and more people will use it.

( )1. A. if  
( )2. A. can’t  
( )3. A. whom   
( )4. A. something
( )5. A. shop  
( )6. A. read    
( )7. A. in  
( )8. A. visit    
( )9. A. interested
( )10. A. useless 

B. when            
B. must         
B. who              
B. nothing         
B. school        
B. see            
B. about           
B. go              
B. bored           
B. helpless  		C. before             
C. may           
C. which               
C. everything        
C. library         
C. watch            
C. on                
C. call              
C. interesting        
C. helpful   
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单项选择题

张某，女，55岁。近来因工作劳累过度，时感气短乏力，与他人争吵后心前区胀痛，且放射到左肩背部，伴心悸失眠，舌暗红苔薄白，脉沉弦。临床辨证为（）

A．寒阻心脉证

B．肝气郁结证

C．气滞血瘀证

D．气滞心脉证

E．心气虚证
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