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【简答题】
将气体A、B置于容积为2L的密闭容器中，发生反应：4A（g）+B（g）═2C（g）反应进行到4s末，测得C的物质的量为0.2mol． （1）用生成物C浓度的增加表示该反应的速率为v（C）=______． （2）分别用A、B、C表示该反应的速率之比为v（A）：v（B）：v（C）=______．
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【单选题】It' s no secret that many children would be healthier and happier with adoptive parents than with the parents that nature dealt them. That's especially true of children who remain in abusive homes bec...
A.
The biological link.
B.
The child's benefits.
C.
The traditional practice.
D.
The parents' feelings.
【简答题】During the school year many parents take on the role of driver as they drive their children from one lesson to another. Many of us want our children to have a little taste of everything, from organize...
【简答题】冰融化时,要克服水分子间____、____、____、____作用力,MgO熔化时需破坏____作用力,S溶于CS 2 中要靠它们之间的____作用力。
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【单选题】It is known to us all that the 11th national games emblem ________ many different meanings.
A.
take on
B.
put on
C.
carry on
D.
get on
【单选题】What has made the man sweat all over the floor?
A.
He has just finished a five-mile running on a running machine.
B.
He has just finished a five-mile running in a park.
C.
He has just done a lot of work.
D.
He has just explored a great park on Jefferson Street.
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