问题 单项选择题

代表挥发油中游离羧酸、酚类和结合态酯总量的指标是()。

A.酸值

B.酯值

C.pH值

D.皂化值

E.折光率

答案

参考答案:D

解析:本题考查要点是"挥发油的化学组成及其理化性质"。①酸值是代表挥发油中游离羧酸和酚类成分含量的指标。以中和1g挥发油中游离酸性成分所消耗氢氧化钾的毫克数表示。②酯值是代表挥发油中酯类成分含量的指标。以水解1g挥发油中所含酯需消耗氢氧化钾的毫克数表示。③皂化值是代表挥发油中游离羧酸、酚类成分和结合态酯总量的指标。以皂化1g挥发油所消耗氢氧化钾的毫克数表示。皂化值是酸值和酯值之和。

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     The World Always Makes Way For The Dreamer
     When I was twelve years old, my father took me to see Zig Zigler. I remember sitting in that dark hall
listening to Mr.Zigler   1  everyone's spirits up to the ceiling. I    2    there feeling like l could do anything. When we got to the car, I turned to my father and said,"Dad,I want to   3   people feel like that." My
father asked me    4    I meant. "I want to be a motivational speaker just like Mr.Zigler."  I replied. A 
  5  was born.
     Recently, I began seeking my dream of motivating others.  6    a four-year relationship with Fortune
100 company    7    as a sales-trainer and ending as a regional sales manager, I left the company at the
height of my   8   .Many people were    9    that I would leave after earning a six-figure income.And they
asked   10    I would risk everything for a dream. I made my   11    to start my own company and leave
my secure position after   12    a regional sales meeting. The vice-president of our company delivered a  
  13  that changed my life  He asked us, "If a god would offer you three wishes, what would they be?"
After giving us a   14    to write down the three wishes, he then asked us, "Why do you need a    15 ?" I
would never forget the power I felt at that moment. I realize that    16  I had accomplished in the past had prepared me for this moment. I was ready and didn't need a god's help to be a motivational speaker. A
motivational speaker was   17 .
     Having made that decision, I was immediately   18  . One week after I gave notice, my husband was
laid off from his job,and now we had no    19 . But I held fast to my dream. The wonder really began to
happen.In a short time my husband found a better job. And I was able to  book several   20  engagements (业务) with new customers. I discovered the incredible power of dreams.

( )1. A. rise          
( )2. A. came          
( )3. A. get          
( )4. A. what          
( )5. A. idea          
( )6. A. Before        
( )7. A. working      
( )8. A. life          
( )9. A. disappointed  
( )10. A. why          
( )11. A. plan          
( )12. A. joining      
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( )14. A. day          
( )15. A. help          
( )16. A. anything      
( )17. A. alive        
( )18. A. examined      
( )19. A. help          
( )20. A. speaking      
B. blow        
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B. that        
B. dream        
B. After        
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B. love        
B. moved        
B. when        
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B. attending    
B. book        
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B. everything  
B. dead        
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C. raise        
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C. which        
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C. delighted    
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C. minds        
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C. money        
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D. put        
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D. speaker    
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D. line      
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D. decision  
D. holding  
D. report    
D. week    
D. god        
D. something
D. missing    
D. choked    
D. income    
D. listening
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