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问题 单项选择题

干粉输送管道进行气密性试验时，对干粉输送管道，要求试验压力为水压强度试验压力的（）。

A．1／2 

B．1／3 

C．2／3 

D．3／4

答案

参考答案：C

完形填空
完形填空  
         Water is the "life blood" of our earth. Like air and sunshine, it is very important   1   living things. Without water, there can be   2   life on the earth. All animals and plants need water. Man also needs water. We need water to drink, to cook and to clean   3   . It even   4 the greater part of our bodies.    
        Water is almost everywhere. Even in the   5   places of the world, there is water in the air. However, we can drink not seawater but fresh water.    
        To make things even  6   ,people often   7   to keep the water clean. They throw rubbish into rivers, lakes or seas. So not all the fresh water is   8   for us to drink. We're short    9   water. Something must be   10   to stop this.
( )1. A. for          
( )2. A. none        
( )3. A. himself      
( )4. A. made of      
( )5. A. driest      
( )6. A. best        
( )7. A. decide      
( )8. A. clean enough
( )9. A. for          
( )10. A. do          

B. to          
B. not          
B. our          
B. make        
B. wetter      
B. worse        
B. try          
B. enough clean
B. in          
B. did          

C. of          
C. much        
C. us          
C. makes up    
C. drier        
C. worst        
C. fail        
C. enough good  
C. at          
C. doing        

D. towards      
D. no            
D. ourselves    
D. made in      
D. beautiful    
D. better        
D. take          
D. dirty enough  
D. of            
D. done          
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判断题

见票后定期付款的汇票，在到期日前提示承兑，到期日起10日内向承兑人提示付款。( )
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