气相色谱法测定环境空气和废气中挥发性卤代烃,当使用FID检测器时,()、()或辛烷做

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气相色谱法测定环境空气和废气中挥发性卤代烃,当使用FID检测器时,()、()或辛烷做内标物。

考点:环境监测上岗考试环境监测综合练习环境监测综合练习题库
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完形填空。
     A French student went to London for his holiday. He thought,"I know  1  English. But I think people can
understand me."
    One day he went to a hotel and sat down at a  2 . He wanted to  3  a cup of tea and some eggs. Soon the
waiter came up to him and asked,"Can I help you?"
    "A cup of tea and..."He could not remember the  4  word for eggs. He looked  5  him, but nobody was
eating eggs. Then he saw  6  on the table next to him. There was a picture of  7  on its cover (封面). He  8  
the picture to the waiter."What is the English for this?"
    "A cock,"answered the waiter."What do you call a cock's wife?"he asked again."A hen.""And what do you
call a cock's children?""Chicks.""And what do you call chicks  9  they are born (出生)?" "Eggs."
    "Very well," said the French student happily. "Bring me two  10  and a cup of tea, please."And he sat down
with a smile on his face.
( )1. A. much       
( )2. A  table     
( )3. A. drink     
( )4. A. French     
( )5. A. at         
( )6. A. a story book
( )7. A. a cock     
( )8. A. read       
( )9. A. when       
( )10. A. hens     
B. a little     
B. door         
B. take         
B. Chinese     
B. for         
B. a picture book
B. a girl       
B. put         
B. before       
B. chicks       
C. more          
C. chair        
C. have          
C. En glish      
C. around                               
C. a history book
C. a child       
C. showed        
C. where        
C. eggs          
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The biggest whale is ___ blue whale, which grows to be about 29 meters long—the height of _____ 9-story building.

A.the; the

B.a; a

C.a; the

D.the; a

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A.最大值

B.最小值

C.平均值

D.代数和

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