问题 单项选择题

在快速自旋回波(TSE)序列中()

A.回波链越长,扫描时间越长

B.回波链越短,扫描时间越短

C.回波链越长,扫描时间越短

D.回波链可以无限制地长

E.扫描时间与回波链无关

答案

参考答案:C

完形填空
完形填空。
     Many children act in TV shows. They work several hours every day, (1)______ they can't go to regular
(2)______. How do they get their schooling? In Hollywood, about forty (3)______ give lessons for the children.
Their work is very (4)______. They make sure that the child (5)______ many different subjects. They make
sure, (6)______, that the child gets enough (7)______ and play. Children in Hollywood must attend classes
twenty (8)______ each week. If not, they can't (9)______ in TV shows any longer. TV children are usually
(10)______ pupils, and most of their teachers (11)______ this kind of work. They give the pupils (12)______
in many interesting (13)______. Sometimes the "classroom" is a Mississippi (14)______. Sometimes it is the
inside of a spaceship. Often the pupils become (15)______ stars.
( )1. A. so       
( )2. A. cinemas  
( )3. A. workers  
( )4. A. important
( )5. A. learns   
( )6. A. still    
( )7. A. money    
( )8. A. days     
( )9. A. sit      
( )10. A. bad     
( )11. A. like    
( )12. A. books   
( )13. A. places  
( )14. A. bus     
( )15. A. bright  
B. for      
B. factory  
B. teachers 
B. nice     
B. knows    
B. yet      
B. rest     
B. months   
B. study    
B. good     
B. hate     
B. pens     
B. rooms    
B. train    
B. healthy  
C. but        
C. school     
C. doctors    
C. interesting
C. forgets    
C. too        
C. study      
C. weeks      
C. work       
C. busy       
C. follow     
C. lessons    
C. markets    
C. car        
C. famous     
D. because  
D. farm     
D. players  
D. good     
D. loves    
D. already  
D. practice 
D. hours    
D. teach    
D. lonely   
D. think    
D. pencils                           
D. parks    
D. boat     
D. lucky    
问答题