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问题 单项选择题

只要求简易储存和包装的是（）

A、供应物流

B、销售物流

C、生产物流

D、回收物流

答案

参考答案：D

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Dear Grandma,
    How's it    1  ? I hope that Grandpa is    2   now. I was sorry to    3   that he    4   cold last week. I hope
you are in good health. Things are fine here. I finished my end-of-year exams last week, and    5   my report
card today. I always get    6   when I see the envelope from school in the mail, but    7   I did OK this time. I    8   a really hard time    9   science the semester, and I wasn't surprised to find that my   10  report was
from my science teacher. She said I was lazy, which isn't true.
( )1. A. going     
( )2. A. good      
( )3. A. heard     
( )4. A. have     
( )5. A. get     
( )6. A. nervous 
( )7. A. Lucky    
( )8. A. have      
( )9. A. for       
( )10. A. worse    		B. go        
B. better     
B. hear     
B. has        
B. got       
B. pushy      
B. Luck      
B. had        
B. to       
B. bad      		C. goes       
C. best      
C. know     
C. had        
C. gets      
C. happy    
C. Luckily    
C. having     
C. with     
C. worst   		D. went          
D. well         
D. listen        
D. was  having                   
D. have         
D. surprised     
D. Luckly        
D. was  having   
D. at           
D. best        
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问答题

图示为一台小型发电机的示意图，矩形线圈在匀强磁场中绕OO′轴匀速转动，磁场方向与转轴垂直．矩形线圈的面积S=2.0×10-2 m2，匝数N=40，线圈电阻r=1.0Ω，磁场的磁感应强度B=0.20T．线圈绕OO′轴以ω=100rad/s的角速度匀速转动．线圈两端外接电阻R=9.0Ω 的小灯泡和一个理想交流电流表．求：

（1）线圈中产生的感应电动势的最大值．

（2）电流表的示数．

（3）小灯泡消耗的电功率．
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