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【单选题】
反应 A→ B(产物) (I);A→ D (II),已知反应 I 的活化能 E1大于反应 II 的活化能 E2,对于目标产物B,选择什么条件有利( )
A.
高温
B.
低温
C.
适中温度
D.
延长反应时间
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举一反三
【单选题】克莱门森(Clemmensen)还原反应,所用催化剂是( )
A.
NaBH4
B.
LiAlH4
C.
Zn-Hg
D.
AlCl3
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【单选题】小明考上了清华，但是他爸爸希望送小明去国外留学读书，已知留学毕业后后每年可以挣10万元人民币，生活费5万元人民币，就读清华的毕业后每年可以挣12万元人民币，生活费3万元人民币。请问小明的决定会带来最多多少的机会成本？
A.
12万元人民币每年的收入
B.
15万元人民币每年的收入
C.
女朋友
D.
22万元人民币
E.
10万元人民币的年收入
F.
9万元人民币的年收入
G.
5万元人民币的年收入
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【单选题】140克莱门森(Clemmensen)还原反应,所用催化剂是( )
A.
NaBH4
B.
LiAlH4
C.
Zn-Hg
D.
AlCl3
查看完整题目与答案
【单选题】根据以下资料，回答20~23题。 At the first sight the planet Mars does not appear very welcome to any kind of life．It has very little oxygen and water, the temperature at night is below -50~Cand winds of 100 miles ...
A.
there is no life there now
B.
there is a large amount of water at the poles
C.
the Mars may be able to support life in the future
D.
conditions may have been similar to those on the Earth
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【简答题】For many years scientists have said that the earth is getting warmer. Now they have found something new-hot cities! In the southern US, they have found that cities become very hot in summer. For examp...
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【单选题】醛、酮的克莱门森（Clemmensen）还原法的反应条件是
A.
NH2NH2/NaOH
B.
Ni/H2
C.
Zn-Hg ，浓 HCl
D.
NaBH4
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【单选题】听力原文： If you've been on campus for very long, I'm certain that you've already heard about this course. You may know that last semester about 50 percent of the students enrolled in my course failed it....
A.
10 points.
B.
2 points.
C.
15 points.
D.
5 points.
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【判断题】在酸性条件下，醛、酮与锌汞齐作用，使羰基直接还原为亚甲基转变为烃的反应叫克莱门森（Clemmensen）还原法。
A.
正确
B.
错误
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【单选题】在酸性条件能够将羰基还原成亚甲基的反应是：
A.
克莱门森（ Clemmensen ）还原法
B.
沃尔夫 - 凯西纳尔 - 黄鸣龙还原法
C.
康尼扎罗（ Cannizzaro ）反应
D.
麦尔外英 - 彭多夫（ Meerwein-Ponndorf ）还原法
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【简答题】If you often have a cold, headache or backache, there is something wrong with your health. Eating healthy food 43 good for our health. Tofu（豆腐）, milk, vegetables are healthy for us. Tofu is a kind of ...
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【单选题】克莱门森(Clemmensen)还原反应,所用催化剂是( )
A.
NaBH4
B.
LiAlH4
C.
Zn-Hg
D.
AlCl3
查看完整题目与答案
【单选题】小明考上了清华，但是他爸爸希望送小明去国外留学读书，已知留学毕业后后每年可以挣10万元人民币，生活费5万元人民币，就读清华的毕业后每年可以挣12万元人民币，生活费3万元人民币。请问小明的决定会带来最多多少的机会成本？
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B.
LiAlH4
C.
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D.
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查看完整题目与答案
【单选题】根据以下资料，回答20~23题。 At the first sight the planet Mars does not appear very welcome to any kind of life．It has very little oxygen and water, the temperature at night is below -50~Cand winds of 100 miles ...
A.
there is no life there now
B.
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C.
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D.
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查看完整题目与答案
【简答题】For many years scientists have said that the earth is getting warmer. Now they have found something new-hot cities! In the southern US, they have found that cities become very hot in summer. For examp...
查看完整题目与答案
【单选题】醛、酮的克莱门森（Clemmensen）还原法的反应条件是
A.
NH2NH2/NaOH
B.
Ni/H2
C.
Zn-Hg ，浓 HCl
D.
NaBH4
查看完整题目与答案
【单选题】听力原文： If you've been on campus for very long, I'm certain that you've already heard about this course. You may know that last semester about 50 percent of the students enrolled in my course failed it....
A.
10 points.
B.
2 points.
C.
15 points.
D.
5 points.
查看完整题目与答案
【判断题】在酸性条件下，醛、酮与锌汞齐作用，使羰基直接还原为亚甲基转变为烃的反应叫克莱门森（Clemmensen）还原法。
A.
正确
B.
错误
查看完整题目与答案
【单选题】在酸性条件能够将羰基还原成亚甲基的反应是：
A.
克莱门森（ Clemmensen ）还原法
B.
沃尔夫 - 凯西纳尔 - 黄鸣龙还原法
C.
康尼扎罗（ Cannizzaro ）反应
D.
麦尔外英 - 彭多夫（ Meerwein-Ponndorf ）还原法
查看完整题目与答案
【简答题】If you often have a cold, headache or backache, there is something wrong with your health. Eating healthy food 43 good for our health. Tofu（豆腐）, milk, vegetables are healthy for us. Tofu is a kind of ...
查看完整题目与答案