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2013年化学奖授予三位美国科学家，以表彰他们在开发多尺度复杂化学系统模型方面所做的贡献。可以用量子化学计算小区间内（如光合作用叶绿体光反应时酶中、生物固氮时固氮酶中）的化学反应。 （1）固氮酶有由铁蛋白和钼铁蛋白两种，它们不仅能够催化N 2 还原成NH 3 以外，还能将环境底物乙炔催化还原成乙烯，下列说法正确的有 （不选择）。 a.C 2 H 2 、C 2 H 4 极性分子 b.碳负离子CH 3 － 呈三角锥形 c.NO + 电子式为 d.NH 3 沸点比N 2 高，主要是因为前者是极性分子 （2）钒可合成电池电极也可人工合成的二价钒（V）固氮酶（结构如下图）。 ①V 2+ 基态时核外电子排布式为 。 ②钒固氮酶钒的配位原子有 (写元素符号)。 ③熔融空气电池钒硼晶体晶胞结构如下图所示，该晶胞中含有钒原子数目为 。 （3）烟酰胺（结构式如图）可用于合成光合辅酶 NADPH ，烟酰胺分子中氮原子的杂化轨道类型有 ，1mol该分子中含σ键数目为 。
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参考答案：
举一反三
【单选题】I ________ a topic for the composition, but haven’t decided yet.
A.
will think about
B.
have been thinking about
C.
had thought about
D.
was thought about
查看完整题目与答案
【单选题】The topic       . Let’s change it .
A.
doesn’t fit to discuss
B.
isn’t fit discussion
C.
doesn’t fit for discussion
D.
isn’t fit for discussion
查看完整题目与答案
【单选题】“以茶代酒”的故事最早发生在( )
A.
战国
B.
汉代
C.
三国
D.
东晋
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【多选题】用水准测量方法测定时,高程达到一定精度的高程控制点,称为水准点。水准点分为哪两种
A.
永久性
B.
标准
C.
国家
D.
一级
E.
临时性
查看完整题目与答案
【单选题】What is the topic for para 5?
A.
first impressions
B.
giving an online date a second chance
C.
what to do if an online date isn't attractive
查看完整题目与答案
【单选题】Which of the following is the main topic of this passage?
A.
Students don't usually eat nutritiously but enjoyably at college.
B.
Students are usually skilled in cooking their own meals.
C.
Students are unable to eat good foods for lack of money.
D.
Student are able to eat nutritiously, cheaply and enjoyably.
查看完整题目与答案
【单选题】The student didn’t find much__________ about the topic on that website．
A.
report
B.
article
C.
information
D.
story
查看完整题目与答案
【简答题】The judge criticized the lawyer because he didn't keep his remarks to the topic ______ discussion. A) on                  B) under              C) with               D) for
查看完整题目与答案
【单选题】What is the man's problem?
A.
He doesn't like the topic of his paper.
B.
He hasn't reviewed the magazines.
C.
He doesn't know how to choose books.
D.
He has no idea about Hollywood.
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【单选题】The most widely discussed psychological topic in the Second Language Acquisition is the role ______ plays in L2 acquisition.
A.
interaction
B.
memory
C.
attention
D.
code-switching
查看完整题目与答案
相关题目：
【单选题】I ________ a topic for the composition, but haven’t decided yet.
A.
will think about
B.
have been thinking about
C.
had thought about
D.
was thought about
查看完整题目与答案
【单选题】The topic       . Let’s change it .
A.
doesn’t fit to discuss
B.
isn’t fit discussion
C.
doesn’t fit for discussion
D.
isn’t fit for discussion
查看完整题目与答案
【单选题】“以茶代酒”的故事最早发生在( )
A.
战国
B.
汉代
C.
三国
D.
东晋
查看完整题目与答案
【多选题】用水准测量方法测定时,高程达到一定精度的高程控制点,称为水准点。水准点分为哪两种
A.
永久性
B.
标准
C.
国家
D.
一级
E.
临时性
查看完整题目与答案
【单选题】What is the topic for para 5?
A.
first impressions
B.
giving an online date a second chance
C.
what to do if an online date isn't attractive
查看完整题目与答案
【单选题】Which of the following is the main topic of this passage?
A.
Students don't usually eat nutritiously but enjoyably at college.
B.
Students are usually skilled in cooking their own meals.
C.
Students are unable to eat good foods for lack of money.
D.
Student are able to eat nutritiously, cheaply and enjoyably.
查看完整题目与答案
【单选题】The student didn’t find much__________ about the topic on that website．
A.
report
B.
article
C.
information
D.
story
查看完整题目与答案
【简答题】The judge criticized the lawyer because he didn't keep his remarks to the topic ______ discussion. A) on                  B) under              C) with               D) for
查看完整题目与答案
【单选题】What is the man's problem?
A.
He doesn't like the topic of his paper.
B.
He hasn't reviewed the magazines.
C.
He doesn't know how to choose books.
D.
He has no idea about Hollywood.
查看完整题目与答案
【单选题】The most widely discussed psychological topic in the Second Language Acquisition is the role ______ plays in L2 acquisition.
A.
interaction
B.
memory
C.
attention
D.
code-switching
查看完整题目与答案
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