为什么交、直流回路不能共用一条电缆?

题型:问答题 简答题

问题:

为什么交、直流回路不能共用一条电缆?

考点:电气运行类技术电气运行类技术题库
题型:问答题 简答题
完形填空。
     When Alice started to cycle home from Jenny's house, she wasn't nervous. She was certainly not afraid
of the dark.   1  , it was only a 15-minute ride home. But halfway there, she began to wish that she hadn't
been so   2  .
     As she rounded a sharp bend, it suddenly   3   cold-very cold. Alice's breath became puffs of white cloud
and her legs were so cold that it became hard to ride.
     With her heart beating fast, she struggled so hard to move   4   that she didn't hear the car which suddenly
appeared beside her. She stopped by the road. The big black car also   5  . Slowly, the passenger-window
began to slide down. Alice held her breath. In the soft light inside the car, something   6  . Then, the light
brightened and Alice was staring at a sweet, grey-haired old lady. "Hello, dear," said the old lady. "I need   7  .
I'm afraid I'm lost. I need to find the nearest airport. I must be there in the next five minutes."
     "Airport? You   8   are lost," Alice said. "You need to go back five kilometers   9   you reach the T-junction.
Turn left and  10  for about another 10 kilometers to the main highway. From there, just follow the  11  to the
airport. But I'm afraid there's no  12  you'll get there in five minutes!"
     "Thank you very much, dear," replied the old lady. "Don't worry-I'll  13  in time."
     The  14  moved up and the car started off. A little way ahead, it  15  and with headlights flashing, it drove
past Alice. But then, something  16  happened. The car began changing. First, its color  17  from black to
silvery-grey. Then, the wheels began disappearing, but the car continued to move forward,  18  just above the
ground. As the car  19  into the dark sky, the big red tail-lights grew larger and larger and glowed more and
more brightly. With a faint whistling  20 , the car was gone in seconds, leaving Alice shaking her head in
disbelief…
( )1. A. However    
( )2. A. brave      
( )3. A. fell       
( )4. A. aside      
( )5. A. arrived    
( )6. A. gathered   
( )7. A. help       
( )8. A. necessarily
( )9. A. if         
( )10. A. drive     
( )11. A. address   
( )12. A. doubt     
( )13. A. have it   
( )14. A. door      
( )15. A. passed    
( )16. A. strange   
( )17. A. developed 
( )18. A. rolling   
( )19. A. pointed   
( )20. A. tune      
B. Besides   
B. excited   
B. seemed    
B. around    
B. stopped   
B. existed   
B. gas       
B. normally  
B. until     
B. walk      
B. signs     
B. room      
B. get it    
B. window    
B. rushed    
B. sensitive 
B. appeared  
B. floating  
B. returned       
B. voice     
C. Therefore  
C. curious    
C. proved     
C. forward    
C. stayed     
C. dropped    
C. rest       
C. basically  
C. unless     
C. follow     
C. notices    
C. time       
C. make it    
C. headlight  
C. turned     
C. imaginable    
C. spread     
C. drawing    
C. broke      
C. sound      
D. Otherwise 
D. stubborn  
D. grew      
D. backward  
D. started   
D. moved     
D. water     
D. certainly 
D. as        
D. march     
D. guidance                   
D. way       
D. finish it 
D. wheel     
D. continued 
D. horrible  
D. faded     
D. flashing  
D. rose      
D. tone      
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运行中的电压互感器类似工作在()状态的变乐器。

A.短路

B.开路

C.断路

D.负载

题型:问答题 简答题

油料从螺杆两端吸人从中间排出的螺杆泵称为()。

A.单螺杆泵

B.双螺杆泵

C.单吸式螺杆泵

D.双吸式螺杆泵

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抽油杆、油管可以作为(),充当处理死油盖子的一种工具。

A、加重杆

B、捞油泵

C、井下衬管

D、扶正杆

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目前公司所有水情数据传输采用了()技术。

A、中波

B、超短波

C、短波

D、GSM

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