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问题 单项选择题 A1/A2型题

MPN是指（）。

A.总大肠菌群菌落数

B.总大肠菌群阳性的管数

C.总大肠菌群最可能数

D.总大肠菌群菌落形成单位

E.总大肠菌群指数

答案

参考答案：C

解析：MPN(mostprobablenumber)称为最可能数。

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       Mr. Jackson began his trip last Saturday. Two days later when he was traveling in the country   1   ,
he saw dog behind a man. As the car came near them, the dog suddenly started to   2   the road. Of
course the car hit the poor animal and killed it.  
       Mr. Jackson   3   his car and walked to the man."I'm very   4   that this happened. "he said. "How
much shall I   5   ? Will ten dollars be enough?"  
      "Oh，yes."said  the  man. "Ten  dollars  will  be   6   enough." Mr. Jackson put his hand into his
pocket，but he only   7   five dollars in the pocket. "Sorry，sir , I've only   8   five dollars." said
Mr. Jackson.    
      "No  problem. That's  enough. "the  man  replied. "Thanks a lot. That's very kind of you. "Mr. Jackson
thanked the man and   9   awa.When the car went a-way，the man looked down at the dog and thought. 
     "I want to know   10   dog it is."

( )1. A. by bus          
( )2. A. go              
( )3. A. started          
( )4. A. sad              
( )5. A. give            
( )6. A. quite            
( )7. A. looked for      
( )8. A. seen.            
( )9. A. drove            
( )10.A. what             		B. by bike    
B. cross      
B. ran        
B. lucky      
B. take      
B. very      
B. looked at  
B. had        
B. ran        
B. whose      		C. by train
C. run      
C. stopped  
C. sorry    
C. bring    
C. much    
C. watched  
C. got      
C. walked  
C. Which             		D. by car        
D. jump          
D. jumped        
D. pleased        
D. pay            
D.so              
D. found          
D. paid          
D. went          
D. where              
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问答题 简答题

对塑料模型腔侧壁和底板厚度进行强度和刚度计算的目的是什么？从哪几方面考虑？
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