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问题 多选题

下列物体受到平衡力的是 [ ]

A．正在走动的钟表的指针

B．沿斜面匀速向上拉动的木块

C．刚刚发射的火箭

D．重10N物体放在水平桌面上，受到2N向上的拉力

答案

BD

完形填空
完形填空。
     Today is   1     . I got up very early (早) in the morning. I went to school at    2    six.    3  _ school
was     4    clean (干净的).    5     were bright (明亮的). The sky was blue. Birds were singing all
the    6     . All the boys were    7       white shirts.    8     were in nice skirts. We sang    9     danced, ran
and jumped. We    10    little birds. How happy we were!
( )1. A. Children's Day
( )2. A. near      
( )3. A. We        
( )4. A. very      
( )5. A. The windows in  
                 our classroom
( )6. A. day        
( )7. A. in      
( )8. A. Boys      
( )9. A. with      
( )10. A. looked at  		B. Children Days
B. about    
B. Us        
B. much      
B. The window of  
     our classroom  
B. way      
B. from      
B. Girls    
B. or        
B. looked after 		C. Day of Children
C. only        
C. Our        
C. too        
C. Our classroom's
     window          
C. today      
C. on          
C. Men        
C. but        
C. looked the same		D. the Children's Day
D. over              
D. Ours              
D. there              
D. The windows of  
     our classroom      
D. time              
D. like              
D. Women              
D. and                
D. looked like        
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名词解释

不可逆极谱波
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