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【单选题】
在反应A->B(活化能为E1),B->C(活化能为E2),A->D(活化能为E3)中,活化能E1 > E2 > E3 ,C是所需要的产物, 从动力学角度考虑,为了提高产物C的产量,选择反应温度时,应选择( )
A.
较高反应温度
B.
较低反应温度
C.
适中反应温度
D.
任意反应温度
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C.
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D.
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A.
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B.
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C.
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D.
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【单选题】Which of the following tag questions is INCORRECT?
A.
There is no doubt about it, is it?
B.
No one was hurt, were they?
C.
She seldom goes to the theatre, does she?
D.
I don't think he is bright, is he?
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【简答题】English and English Community 1 There is no doubt that English is a useful language. The people who speak English today make up the largest speech community in the world with the exception of speakers...
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【判断题】Xiaoyu goes back home every day. ()
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【单选题】There is no doubt _____ he’s an honest boy ,so there is no doubt _____ his honesty.
A.
whether ;for
B.
that ;of
C.
what ;about
D.
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查看完整题目与答案
【单选题】There is no doubt that environmental regulation
A.
is cumbersome
B.
produces an effect
C.
varies wildly
D.
needs to be streamlined
查看完整题目与答案
【单选题】联合国提出预防性病的“ABC”原则不包括
A.
接受性教育，科学防范性病。
B.
节制欲望，青少年最好避免过早性行为。
C.
忠诚，固定性伴侣，不与陌生人发生性关系。
D.
安全套，安全套对于防治性病和艾滋病，是非常有效的方法。
查看完整题目与答案
【单选题】There is no doubt ______you will be welcomed warmly.
A.
． how
B.
． why
C.
． if
D.
． that
查看完整题目与答案
【单选题】Which of the following tag questions is INCORRECT?
A.
There is no doubt about it, is it?
B.
No one was hurt, were they?
C.
She seldom goes to the theatre, does she?
D.
I don't think he is bright, is he?
查看完整题目与答案
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