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问题 单项选择题

属于对混式磨粉机磨粉部分的是（）。

A.圆筛

B.磨辊

C.齿轮

D.V带

答案

参考答案：B

完形填空
完形填空。
     Mr. Black  works   1   Mrs White. She is old, fat  and  rich (富有).  He  works in  her  garden. Mrs
White doesn't know   2   about the garden, but she usually tells him to do this or   3   that. This makes
Mr. Black very angry.   4   he calls her elephant.
     Mrs White is not happy to hear that. She   5   Mr. Black to the judge (法官). The judge hears the
story and says, "Mr. Black, it is   6   to call a lady elephant. You   7   do that again."
     "Yes."says Mr. Black. "Do you mean that I mustn't call this lady elephant?" "  8   right," says the judge.
     "And can I call   9   elephant lady?" Mr. Black asks.
     "Yes, you can." the judge answers. Then Mr. Black looks at the   10  and says, "Goodbye, lady."
( )1.A. with    
( )2.A. anything   
( )3.A. not do  
( )4.A. So      
( )5.A. brings  
( )6.A. right    
( )7.A. must    
( )8.A. All      
( )9.A. an      
( )10.A. judge   		B. for        
B. everything         
B. not doing  
B. But        
B. takes      
B. happy      
B. mustn't  
B. That's    
B. a          
B. elephant   		C. to        
C. something         
C. don't do
C. And      
C. takes    
C. wrong    
C. can      
C. It      
C. the      
C. woman     		D. by        
D. nothing           
D. not to do                
D. Or        
D. put        
D. angry      
D. may      
D. This      
D. /          
D. man        
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实验题

小英在测量小灯泡的电功率实验中，所用小灯泡的额定电压为3.8V，电源电压为3V．

（1）请你用笔画线代替导线，将如图中的实物电路图连接完整．

（2）小英在实验中连接好电路，并移动滑片P，依次得出以下数据：

 灯泡两端电压U/V电路中的电流I/A
12.80.28
22.50.25
32.20.22
分析上面表格中数据，此实验操作有何不规范之处？　          　．

（3）请帮小英计算第2次实验中小灯泡的实际功率P=　         　W；并通过以上实验数据间接计算小灯泡的额定功率，P额=　         　W．
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