问题 单项选择题

电主轴(将电动机的转子轴和机床的主轴合成一个轴)在转速高于15000r/min时,需要用()润滑。

A.油脂

B.油雾

C.液态机油

D.水

答案

参考答案:B

完形填空
完形填空。

     Hi,    1   Sammi. I'm in    2    Three,    3   One. I'm    4   England. I'm short but I'm    5     6    are
sixteen boys and eighteen   7   in my class. Look! This is   8   classroom. There are two   9   on the wall.
 There is a picture on the wall, too. There are fifteen desks and a  10  in the classroom. There is a  11  
behind the chair. It is our  12 . On the  13  desk, there are twenty  14  books.  15  to my classroom!

( )1. A. He's            
( )2.A. Grade          
( )3. A. Grade         
( )4. A. from         
( )5. A. thin       
( )6. A. They       
( )7. A. boys       
( )8. A. me           
( )9. A. pictures     
( )10. A. chair         
( )11. A. swimming-pool      
( )12. A. girl's         
( )13. A. teacher's    
( )14. A. happy      
( )15. A. Get          

B. I'm         
B. Class        
B. Class         
B. in             
B. fat          
B. Their        
B. girls       
B. mine          
B. policemen   
B. table        
B. classroom          
B. teacher's    
B. students'   
B. sad          
B. Welcome  
C. This is      
C. Room          
C. Room         
C. to             
C. strong       
C. There         
C. students   
C. my            
C. offices     
C. desk         
C. door            
C. boy's        
C. boys'     
C. short        
C. Go       
D. That is          
D. Classroom           
D. Classroom           
D. at                    
D. tall              
D. You                  
D. teachers       
D. I                     
D. blackboards      
D. book               
D. bag                              
D. book                
D. girls'       
D. new              
D. Leave           
单项选择题