问题 问答题 简答题

通常根据扩频的不同实现方法,将码分多址分为哪几种?

答案

参考答案:

直接序列码分多址

跳频码分多址

跳时码分多址

混合码分多址

完形填空
完型填空。
     I was very fond of hunting when I was a young man. In the autumn of 1915, I was   1   in the northwest
of India. One evening, after hunting in the forest all   2  , I was returning alone to the place where I had   3   
up my tent. I was tired   4   hungry. It was getting   5   and darker, and I was walking slowly   6   a narrow
path. On my right was a wide river; on my left, a   7  , dark forest. All of a   8  , I saw two green eyes looking
at me from among the trees. I knew it   9   be a man-eating tiger. The tiger was getting ready to  10  on me.
      My heart  11 . What could I do? Should I jump  12  the river and hope to save my life  13  swimming? I
looked to the  14 . In the river there was a  15  crocodile waiting to welcome me with its mouth  16  open. I
was so  17  that I shut my eyes. And I thought it would be the end of my  18 . I heard branches moving 19  
the tiger roared (咆哮) and jumped.  20  then I opened my eyes. What do you think had happened? The tiger
had jumped right over me and now in the jaws (嘴) of the crocodile.
( )1. A. practising  
( )2. A. day         
( )3. A. turned      
( )4. A. but          
( )5. A.  colder     
( )6. A. by          
( )7. A. thick       
( )8. A. shock       
( )9. A. could       
( )10. A. live        
( )11. A. beat        
( )12. A. across      
( )13. A. on          
( )14. A. front       
( )15. A. big         
( )16. A. long        
( )17. A. tired       
( )18. A. work        
( )19. A. though      
( )20. A. Just        
B. study ing 
B. night     
B. put       
B. and       
B. warmer    
B. beside    
B. strong    
B. joy       
B. can       
B. depend    
B. sank      
B. over      
B. of        
B. back      
B. small     
B. short     
B. excited       
B. study     
B. as        
B. Even      
C. p lanting  
C. the time   
C. made       
C. or         
C. brighter   
C. along      
C. tall       
C. sudden     
C. must       
C. look       
C. ached      
C. into       
C. with       
C. left       
C. dead       
C. wide       
C. frightened     
C. day        
C. but        
C. Still      
D. travelling   
D. the year     
D. brought      
D. n or         
D. latter       
D. on           
D. short        
D. surprise     
D. should       
D. jump         
D. jumped                          
D. from         
D. by           
D. right        
D. dying        
D. narrow       
D. surprised    
D. life         
D. or           
D. Only         
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