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【简答题】
在一定条件下，科学家利用从烟道气中分离出CO 2 与太阳能电池电解水产生的H 2 合成甲醇，其过程如下图所示，试回答下列问题 （1）该合成路线对于环境保护的价值在于________________。 （2）15～20%的乙醇胺（HOCH 2 CH 2 NH 2 ）水溶液具有弱碱性，上述合成线路中用作CO 2 吸收剂。用离子方程式表示乙醇胺水溶液呈弱碱性的原因：_______________________。 （3）CH 3 OH、H 2 的燃烧热分别为：△H＝－725．5kJ/mol、△H＝－285．8kJ/mol，写出工业上以CO 2 、 H 2 合成CH 3 OH的热化学方程式：_____________________。 （4）据报道，在300℃、70MPa下由二氧化碳和氢气合成乙醇也已成为现实。 2CO 2 (g)+6H 2 (g) CH 3 CH 2 OH(g)+3H 2 O(g) 下列叙述正确的是_______________ a．使用Cu-Zn-Fe催化剂可大大提高生产效率 b．反应需在300℃进行可推测该反应是吸热反应 c．充入大量CO 2 气体可提高H 2 的转化率 d．从平衡混合气体中分离出CH 3 CH 2 OH和H 2 O可提高CO 2 和H 2 的利用率
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举一反三
【判断题】An important characteristic of management by objectives is its non-participatory nature.
A.
正确
B.
错误
【简答题】设 A为 3阶矩阵, ,则 .
【简答题】设A为3阶矩阵,且 ,则
【简答题】设A为3阶矩阵，∣A∣=1，则∣-2A∣=
【简答题】设A为3阶矩阵, ,则 = 。
【单选题】Which of the following is an example of a conceptual slippery slope argument?
A.
A person who never votes is politically non-participatory. The difference between voting once in your life and voting never is not a significant difference. A person who votes in annual elections at least thirty times is politically active. ________________________________________ Therefore, there is no significant difference between being politically active and being politically non participatory.
B.
A person who never votes is politically non-participatory. The difference between voting once in your life and voting never is a very significant difference. A person who votes in annual elections at least thirty times is politically active. ________________________________________ Therefore, there is a very significant difference between being politically active and being politically non participatory.
C.
A person who never votes is politically non-participatory. The difference between voting once in your life and voting never is not a significant difference. A person who votes in annual elections at least thirty times is politically active. ________________________________________ Therefore, there is a very significant difference between being politically active and being politically non participatory.
D.
A person who never votes is politically non-participatory. A person who votes one more time than a politically non-participatory person is also politically non-participatory. ________________________________________ Therefore, a person who votes in annual elections at least thirty times is politically non-participatory.
E.
none of the above
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