问题 单项选择题

消除散射线最有效的方法是

A.固有滤过

B.缩小照射野

C.增加物-片距

D.减少曝光条件

E.使用滤线栅

答案

参考答案:E

解析:使用滤线栅是消除散射线最有效的方法。

完形填空
完形填空。
     The Spring Festival is the Chinese New Year's Day. It usually _ 1    in February. Everyone in    2   
 likes the Spring Festival very much. When Spring Festival comes, Li Lei usually    3    his parents clean
their house and do some    4    and other housework .   5    that day    6    in China eats    7   , New
Year's cake and some other    8    food . Li Lei like New Year's cake , but Wang Lin says jiaozi is better
than New Year's cake. The Chinese people    9    the New Year's cake and jiaozi in their houses.  10   
happy they are!
( ) 1. A. come            
( ) 2. A. America          
( ) 3. A. asks            
( ) 4. A. cleaning        
( ) 5. A. On              
( ) 6. A. everyone        
( ) 7. A. eggs            
( ) 8. A. delicious(美味的)
( ) 9. A. eat              
( )10. A. Much            
B. gets    
B. China  
B. tells  
B. fishing
B. In      
B. someone
B. meat    
B. good    
B. make    
B. Very    
C. comes    
C. England  
C. carries  
C. reading  
C. Of        
C. no one    
C. jiaozi    
C. fast      
C. buy      
C. What      
D. goes        
D. Australia  
D. helps      
D. shopping    
D. At          
D. everything  
D. mooncakes  
D. best        
D. sell        
D. How        
多项选择题