问题 问答题 简答题

聚合物脱水及干燥过程有何区别?

答案

参考答案:

经分离、水洗的聚合物粗产品中一般含有一定量(如40-70%)水分和少量其他有机挥发分,必须除去。工业上,将水分从初始含量脱除到5-15%的过程称为脱水,进一步将剩余水分和少量其他挥发分脱除至0.5%以下的过程称为干燥。脱水和干燥可单独为两步,也可联合成一个连续的过程。

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     When I was a teenager growing up in France, I wanted to leave school and have my own life. The only
way I could do this was to work in the local paper factory in my town, or get married. I was very nervous
then I told my  1  I wanted to leave school. I thought he would say, "  2  ! You are going to college." I was
very  3  when he said, "OK. Let's go to the paper factory."
     Two days later, he took me to the factory. I imagined everyone to be friends  4  together and having fun.
I even imagined there would be music and singing. I guess I had watched too many movies as a teenager.
     When we  5  the factory gate, my father spoke to the guard and one minute later we were  6 . I walked
around the factory looking at the building, the workers, and listening to the noise. It was  7 . I ran back to
my father and said, "I want to go home."
     He asked me,"What do you think of the factory?"
     "Too bad," I answered.
     "And marriage is even  8 !" he said.
     I went back to school the next day thinking about studying hard  9  I could get into a good college. I  10 
 studying English, so I decided to major in languages at college. Thanks to my father and our trip to the paper
factory, I now work at the United Nations and my father is very proud of me. I married a very good man and
my life is much better than it would have been working in the factory!
( )1.  A. teacher 
( )2.  A. Yes     
( )3   A. angry   
( )4.  A. working 
( )5.  A. looked at
( )6.  A. outside 
( )7.  A. terrible
( )8.  A. better  
( )9.   A. but    
( )10.  A. enjoyed
B. friend     
B. No         
B. tired      
B. studying   
B. returned to
B. inside     
B. wonderful  
B. harder     
B. if         
B. stopped    
C. father    
C. Really    
C. nervous   
C. singing   
C. arrived at
C. back      
C. funny     
C. worse     
C. so that   
C. disliked  
D. brother 
D. OK      
D. surprised
D. farming 
D. left for
D. away    
D. special                                
D. easier  
D. or      
D. minded  
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