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问题 选择题

如果10 N的力能使弹簧压缩10 cm，为在弹性限度内将弹簧拉长6cm，则力所做的功为                                    

A．0.12 J

B．0.18 J

C．0.26 J

D．0.28 J

答案

答案：B

完形填空
完形填空。
     Frank is sixty. But he looks  1 . He has a  2  sports collection. He  3   10 tennis rackets, 8 baseballs, 6
basketballs, 12 soccer balls  4  18 volleyballs. But he  5  sports. He  6  likes collecting sports things. His  7 ,
David, likes soccer. He is a member (成员) of a soccer  8 . He plays  9  every day with his friends. He  10  
his father's collection.
( )1. A. old     
( )2. A. great     
( )3. A. there is  
( )4. A. and      
( )5. A. doesn't  
( )6. A. and       
( )7. A. daughter  
( )8. A. ball      
( )9. A. basketball
( )10. A. likes    
B. young     
B. small      
B. there are 
B. or        
B. don't play
B. only      
B. son       
B. club      
B. baseball  
B. like      
C. nice    
C. some    
C. have     
C. but      
C. plays    
C. too     
C. father  
C. class    
C. soccer  
C .watches  
D. fun          
D. many         
D. has          
D. so           
D. doesnt play
D. doesn't     
D. uncle           
D. school                    
D. volleyball   
D. plays        
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单项选择题

在项目进度管理中，表达项目各工作间逻辑关系的项目网络图是（）的主要成果。

A.工作排序

B.工程进度计划

C.工作时间估计

D.项目进度控制
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