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问题 单项选择题

关于类风湿关节炎正确的描述是

A．主要为关节退行性改变

B．以近端指、掌关节及腕关节为主的对称性、小关节肿痛、活动受限

C．一般不出现功能障碍

D．不出现关节畸形

E．晨起活动无特别不适

答案

参考答案：B

完形填空
完形填空。
        Here is a picture   1   Mike's family. The man is   2   father. A   3   is behind Mike. She is   4  .   5   teachers. A girl is   6   picture, too. She's Mike's sister, Lucy Brown. Mike and his sister are in the same   7  . But they   8   in the same grade. They   9  father. They are   10  .
( )1. A. on         
( )2. A. Mike        
( )3. A. boy        
( )4. A. his mother    
( )5. A. She's     
( )6. A. in a       
( )7. A. school      
( )8. A. isn't      
( )9. A. look like his    
( )10.A. English      

B. to    
B. Mike's  
B. girl    
B. his father 
B. He's  
B. in       
B. class    
B. am not  
B. look  his      
B. America    

C. of              
C. Mikes          
C. man            
C. his brother       
C. You're      
C. in the          
C. grade          
C. aren't        
C. look like their    
C. China          

D. in                      
D. Mike of                
D. woman                  
D. his sister              
D. They're            
D. on the                  
D. team                    
D. are                  
D. look after their        
D. Chinese                

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单项选择题

如图6-35所示，水管直径为50mm，1、2两断面相距15m，高差3m，通过流量Q=6L/s，水银压差计读值为2501mm，管道的沿程阻力系数为（）。

A.0.012

B.0.022

C.0.031

D.0.018
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