室温下向10mLpH=3的醋酸溶液中加入水稀释后,下列说法正确的是( ) A.溶

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问题:

室温下向10mLpH=3的醋酸溶液中加入水稀释后,下列说法正确的是(  )

A.溶液中导电粒子的数目减少

B.醋酸的电离程度增大,c(H+)亦增大

C.再加入10mLpH=11的NaOH溶液,混合液pH=7

D.溶液中

c(CH3COO-)
c(CH3COOH)•c(OH-)不变

考点:弱电解质的电离
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完形填空。
     Just because I have learnt English really well in the university,there is a good chance I will be able to
stay on as a teacher with the university where I am _ 1   . Most of my friends and parents    2  that it's best
for a girl to be a university teacher.    
     But I don't know    3    to do. It is not that I wouldn't like to be a teacher. But I don't want to stay, not
now, because I need some experience in telling my students how to turn   4   into practice.    
     I once taught Business English at a night school, yet I had never done any business. Though I prepared my lessons well, Ito create a " real-life"  situation (情景)  for my students with. I feel now it is not the right
time for me to still   5   to practice    6   here andspend my life in a university. I want to work in a place
where I can-   7   what I've learnt: my knowledge of English and French. I alsowant to know more about other things.    
     I know that   8    I leave the university, I shall start from the beginning in some ways,up with others ancl
then,but I'm    9    to learn, to work hard to keep if possible, surpass(超过) them.  English can be a good
tool to help me. It is a  10  to an end, but not the end itself.
( )1.A. visiting
( )2.A.know      
( )3.A.whether  
( )4.A.pictures  
( )5.A.failed    
( )6.A.study    
( )7.A.learn    
( )8.A.if        
( )9.A.free      
( )10.A.language

B.working
B.think  
B.what    
B.covers  
B.enjoyed
B.work    
B.finish  
B. before
B.slow    
B.means  

C.studying
C.excuse  
C.how    
C.pages  
C.decided
C.travel  
C.worry  
C.until  
C.ready  
C.life    

D.playing
D.hear    
D.why    
D.theory  
D.needed  
D.wait    
D.use    
D.even    
D.polite  
D.story  

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维管束是一个复合组织,双子叶植物的维管束由木质部、韧皮部和()组成。

A.形成层

B.皮层

C.内皮层

D.木栓层

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门户网站

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真正的社会主义的思潮和学说的理论源源来自下面哪几个方面()

A.空想社会主义

B.黑格尔的思辨哲学

C.费尔巴哈的人道主义

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请简述XPON系统的DBA的定义及功能?

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