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问题 选择题
某交流电电源电压的瞬时值表达式为u=6sinl00πt（V），则下列说法中正确的是（　　）

A．用交流电压表测该电源电压时，示数是6V

B．用交流电压表测该电源电压时，示数是6V

C．用此电源给电磁打点计时器供电时，打点的时间间隔为0.01s

D．把标有“6V 3W”的小灯泡接在该电源上时，小灯泡将被烧毁

答案

答案：A

改错题
改错题。
Dear Xiao Fei,                                            
     I'm glad to receive your e-mail. I'd like to discuss   
the problem which you mentioned in it to you.            
                                                           
    It's true that some computer games are real interest-   
ing                                                       
and they can sometimes make you felt relaxed. However,    
it                                                        
uses you too much time to do that. You are not a little   
boy.                                                      
You should learn to control (控制) ourselves. Why not     
                                                            
trying to finish your homework first every day and then   
                                                            
spend a little time surf the Internet? You'll find many   
other                                                     
thing that are also very interesting, such as visiting cool
                                                           
websites, learning the latest news but listening to the    
music.                                                    
    I'm sure you'll become an useful person in the         
future.                                                   
    Best Wishes!                                           
    Yours.                                                 
    Gao Hui                                                
1._____   
          
2._____   
          
3._____   
          
4._____   
          
5._____   
          
6._____   
          
7._____   
          
8._____   
          
9._____  
          
10._____  
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单项选择题

循环经济以提高资源利用效率为核心，其重点是资源节约、资源综合利用和( )。

A．新技术应用
B．清洁生产
C．产业集群化
D．制度保障
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