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问题 单项选择题

用4：1衰减曲线法整定调节器参数时，做出的4：1曲线是在什么工作条件下获得的（）。

A、手动遥控控制

B、自动控制纯比例作用

C、自动控制比例加积分

D、自动控制比例加微分

答案

参考答案：B

完形填空
完形填空。
     It is Saturday morning. Sue __1__ breakfast. Sue's mother and father are with her. On Saturday
 morning Sue __2__  go to school. She helps her mother and father __3__  home. This morning, she says
  to her mother, "__4__  I help you, Mummy?"
      "Yes, you can, Sue." her mother says, "You can go to Mr. Hunter's __5__.Our clock is __6__  his
 shop."
       "Mr. Hunter mends clock." Sue's father says.
       "Is he __7__  our clock?" Sue asks.
       "Yes." her father says, "And this morning it's ready."
       "Yes, it's ready." her mother says, "__8__  Mr. Hunter's shop, Sue. Take this bag. You can put the
 clock in it."
        Sue takes this bag.
        "Here is eighty pence, Sue." her father says, "Give it to __9__, please."
        "Yes, Daddy." Sue says. She puts the pence in the bag.
        "__10__ , Mummy and Daddy." she says. Sue is happy. She is helping her mother and father.
( ) 1. A. is having        
( ) 2. A. isn't            
( ) 3. A. in                
( ) 4. A. do                
( ) 5. A. home              
( ) 6. A. in                
( ) 7. A. mend              
( ) 8. A. Go                
( ) 9. A. Mrs. Hunter      
( ) 10. A. Good morning     		B. is hasing         
B. doesn't        
B. on                
B. Do                
B. shop              
B. on                
B. mends            
B. Go to            
B. Mr. Hunter        
B. Good evening      		C. has          
C. don't    
C. at          
C. can          
C. school      
C. to          
C. mending      
C. go          
C. Miss Hunter  
C. Good-bye     		D. having            
D. aren't        
D. to                
D. Can              
D. team              
D. at                
D. to mend          
D. go to            
D. the Hunters      
D. Good afternoon    
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单项选择题

小规模纳税人销售自己使用过的固定资产（）

A.3%的征收率

B.减按2%征收率

C.4%征收率减半征收

D.6%征收率
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