什么是海水组成的恒定性?

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问题:

什么是海水组成的恒定性?

考点:水利工程工程水文学工程水文学题库
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完形填空。
     A passenger (乘客) told an air hostess (空姐) that he needed a cup of water to take medicine when
the plane just took off. She told him that she would bring him the   1   soon.
     Twenty minutes   2 , when the passenger's ring for service sounded, the air hostess realized it at once.
She was kept so busy that she   3   to bring him the water. Therefore, the passenger was held up (延迟)
to take his medicine. She hurried over to him with a cup of water, but he   4   it.
     In the following hours on the flight,   5   time the air hostess passed the passenger, she would ask him
with a smile   6   he needed help or not. But the passenger never   7   her words.
     When he  was going to  get off   the     8   ,   the passenger asked the  air hostess  to hand   him the
passengers' booklet (意见簿). She was very   9    . She knew that he would write down sharp words,
which might make her   10   the job.   11   with a smile she handed it to him.
     Off the plane, she   12      the booklet, and cracked a smile, for the passenger put it, "On the flight,
you asked me if I needed help for twelve times   13  . How can I refuse   14   twelve sincere smiles?"
     That's right! It was the twelve smiles of the air hostess that touched (感动) the passenger  15   and
of  course she wouldn't lose her job!
( )1. A. milk        
( )2. A. late        
( )3. A. remembered    
( )4. A. accepted      
( )5. A. some       
( )6. A. why           
( )7. A. paid attention to
( )8. A. coach        
( )9. A. happy       
( )10.A. lose          
( )11.A. And         
( )12.A. opened        
( )13.A. at all        
( )14.A. her         
( )15.A. peacefully   
B. juice    
B. later     
B. forgot  
B. took    
B. either   
B. when     
B. thought of  
B. bus     
B. cheerful  
B. loses      
B. So       
B. closed    
B. in all  
B. your    
B. comfortably
C. coffee  
C. ago     
C. wanted
C. refused
C. another
C. whether    
C. heard of
C. train
C. sad  
C. losing
C. Then  
C. destroyed
C. of all
C. their
C. deeply  
D. wate r            
D. after            
D. learned          
D. received          
D. each              
D. how              
D. worried about    
D. plane            
D. excited          
D. lost              
D. But              
D. hid              
D. all over          
D. our              
D. slowly            
 
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A.大骨盆

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E.透明软骨

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A.Na2CO3 KCl Na2SO4

B.CuSO4 HCl KCl

C.HCl KOH Na2CO3

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