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在一定体积的密闭容器中，进行如下化学反应：CO 2 （g）+H 2 (g) CO(g)+H 2 O(g) △H=aKJ·mol -1 ,其化学平衡常数K和温度t的关系如下表： t/℃ 700 800 830 1000 1200 K 0.6 0.9 1.0 1.7 2.6 下列说法中正确的是A.
该反应的正反应为吸热反应，即a>0
B.
当υ正(H 2 )=υ正(H 2 O )时，该反应达到化学平衡状态
C.
当其他条件不变时，若缩小容器的体积，则有利于该反应正向移动
D.
当平衡浓度符合c(CO 2 )·c(H 2 )=c(CO)·c(H 2 O)时的温度为830℃、、
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【简答题】造林树种选择的意义、基本原则和基本方法是什么？
【单选题】To be honest, the role John plays in this film doesn't come up to my __________, though he is one of my favorite actors . [ ]
A.
excuses
B.
explanations
C.
experiences
D.
expectations
【单选题】There're so many beautiful gifts in the shop, but I don't know ________. [ ]
A.
to choose which one
B.
what choose
C.
which one to choose
D.
to choose what
【单选题】We have 3 rooms ____________ , but I can’t decide ____________ .
A.
to live, to choose which one
B.
lived, choose which one
C.
to live in, which one to choose
D.
live, which one
【单选题】The suits look _____ beautiful _____ I don't know _____. [ ]
A.
too; to; which one to choose
B.
so; that; which one to choose
C.
so; that; choose which one
D.
too; to; which to choose
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【单选题】. There is such an occasion ___________ we know lots of words, but we can’t choose a suitable one to express ourselves.
A.
where
B.
when
C.
which
D.
what
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