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问题 单项选择题

防护外壳的防护等级低于IP4X的安全触点，其电气间隙和爬电距离应不小于（）。其触点断开后的距离不小于（）。

A.5mm；3mm

B.6mm；4mm

C.6mm；5mm

答案

参考答案：B

完形填空
完形填空。
       Dick was a clever boy, but his parents were poor, so he had to work   1   his spare time and during his
holidays to   2   his education.   3   this, he   4   get to the university, but it was   5   expensive to study there
that during the holiday he found   6   necessary to get two jobs   7   the same time   8   make enough
money   9   his studies.
       One summer he managed to  10  a job in a butcher's shop (肉店) during  11 , and another in a hospital 
 12 . In the shop, he learnt to cut meat quite nicely, so the butcher often  13  him doing all the serving  14  
he went to the back room to do the accounts (账目). In the hospital,  15 , he was, of course, allowed to do
the simplest jobs,  16  helping to lift people and to  17  them from one part of the hospital to another. Both at
the butcher's shop and at the hospital, Dick had to  18  white clothes.
       One evening at the hospital, Dick had to help a woman from her bed to the place  19  she was to have
an operation. The woman was already feeling frightened at the  20  of the operation before he came to get her,
but when she saw Dick, she fainted away (晕过去).
( )1. A. on             
( )2. A. pay for        
( )3. A. Instead        
( )4. A. tried to       
( )5. A. too            
( )6. A. it's          
( )7. A. at             
( )8. A. in order that  
( )9. A. with           
( )10. A. look for       
( )11. A. day time       
( )12. A. at night      
( )13. A. let            
( )14. A. while          
( )15. A. on other hand  
( )16. A. like           
( )17. A. want           
( )18. A. on             
( )19. A. that           
( )20. A. thought        		B. in             
B. pay off        
B. Instead of     
B. hope to        
B. very           
B. this          
B. on             
B. as to          
B. for            
B. find           
B. the night     
B. at noon       
B. left          
B. as soon as    
B. on another hand  
B. for           
B. fetch          
B. wear           
B. which          
B. time           		C. at                  
C. pay to              
C. In spite of         
C. wanted to           
C. so                  
C. that               
C. by                 
C. as so to           
C. to                 
C. reach              
C. the night time      
C. in the morning     
C. made                
C. after               
C. on the second hand  
C. as                  
C. carry              
C. be on               
C. where               
C. end                  		D. with              
D. pay back          
D. In need of        
D. was anxious to    
D. much              
D. it                
D. for               
D. so as to          
D. because of        
D. take              
D. the daytime       
D. in the daytime    
D. had               
D. until             
D. on the other hand       
D. from              
D. raise             
D. dress on          
D. there             
D. beginning         
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