试题与答案

设备转动和滑动部分会出现哪些劣化现象？劣化的原因是什么？

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题型：问答题 简答题

题目：

设备转动和滑动部分会出现哪些劣化现象？劣化的原因是什么？

答案：

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hundreds of songs   7  . On festivals they used to act and sing in praise of heroes
   8   lived long ago.  This was at a time   9    there was no radio, TV or
cinema.  Many of the country people   10  read nor write.  In this way stories
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( )2. A. why        
( )3. A. learn      
( )4. A. about      
( )5. A. sad        
( )6. A. were used to
( )7. A. with heart  
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( )9. A. where      
( )10. A. can neither		B. by writing
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B. are using
B. by heart  
B. whom      
B. in when  
B. can either		C. in writing  
C. what        
C. are leaming  
C. for          
C. sorry        
C. used lo      
C. to heart    
C. when        
C. that        
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D. usedn't    
D. in mind    
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