吊机的卷筒及滑轮在什么情况时需要更换?

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问题:

吊机的卷筒及滑轮在什么情况时需要更换?

考点:吉林知识竞赛设施设备设施设备题库
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完形填空。
     On Sunday morning, I usually get up very late. I wash my face and then go out to __1__ morning
 exercises. After I eat my breakfast, I often go to a shopping centre__2__ my mother. The shopping
 centre is near our home, so we __3__ there. It takes us about 20 minutes to get there on foot. The
 shopping centre has a good name. It is called "新世纪购物中心"in Chinese. It doesn't have an __4__ 
 name. Can you __5__ to put it into English? It is new and big. __6__ many things there, such as (诸如)
 TVs, fridges, bikes, computers, clothes, books, food and drinks. There are many __7__ there. There are
  men and women, old and __8__ .Parents must __9__ their children. The shopping centre is so big.
Young children may get lost (迷路) in it . __10__ do many people come here to buy things? Do you
 know? Let me tell you. The things there are usually good and cheap. The workers there are always nice
  and friendly. If you come to my home, I can take you there and have a look.
( ) 1. A. make        
( ) 2. A. for        
( ) 3. A. take a taxi
( ) 4. A. old        
( ) 5. A. help        
( ) 6. A. There is    
( ) 7. A. students    
( ) 8. A. tall        
( ) 9. A. look after  
( ) 10. A. What      
B. do        
B. and        
B. walk      
B. big        
B. helps      
B. There are  
B. people    
B. short      
B. look for  
B. Who        
C. run        
C. with        
C. by bus      
C. English    
C. to help    
C. They are    
C. children    
C. young      
C. look at    
C. Why        
D. play          
D. of            
D. run          
D. French        
D. helping      
D. It's        
D. teachers      
D. small        
D. look like    
D. When          
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