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【单选题】
关于乳糖操纵子的叙述，下列哪项是正确的A.
属于可诱导型调控
B.
属于可阻遏型调控
C.
结构基因产物抑制分解代谢
D.
结构基因产物与分解代谢无关
E.
受代谢终产物抑制
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反馈参考答案：
举一反三
【单选题】以下反应可用焓判据来解释的是 [ ]
A.
氯化钠自发地溶于水
B.
2N 2 O 5 (g)=4NO 2 (g)+O 2 (g) △H=+56.7 kJ. mol -1
C.
( NH 4 ) 2 CO 3 (s)=NH 4 HCO 3 (s)+NH 3 (g) △H=+74.9kJ．mol -1
D.
2H 2 (g)+O 2 (g)=2H 2 O(l) △H=-285.8 kJ.mol -1
【简答题】A．The judgment of distance. B．The sense of judgment. C．The skill of maneuvering. D．The size of vehicles.
【单选题】以下自发反应可用焓判据来解释的是 [ ]
A.
硝酸铵自发地溶于水
B.
2N 2 O 5 (g) 4NO 2 (g)+O 2 (g) ΔH=+56 . 7 kJ/mol
C.
(NH4) 2 CO 3 (s) NH4HCO3(s)+NH 3 (g) ΔH=+74 . 9 kJ/mol
D.
2H 2 (g)+O 2 (g) 2H 2 O( l ) ΔH=-571 . 6 kJ/mol
【单选题】According to the author, which of the following can be a chief function of the sense of humor?
A.
Strengthening human relations.
B.
Keeping a correct sense of values.
C.
Eliminating comic stereotypes.
D.
Singling out adverse comments.
【单选题】以下反应可用焓判据来解释的是 [ ]
A.
硝酸铵自发的溶于水
B.
2N 2 O 5 (g)=4NO 2 (g)+O 2 (g) △H=+56.7 kJ. mol -1
C.
( NH 4 ) 2 CO 3 (s)=NH 4 HCO 3 (s)+NH 3 (g) △H=+74.9kJ．mol -1
D.
2H 2 (g)+O 2 (g)=2H 2 O(l) △H=-285.8 kJ.mol -1
【单选题】What can you learn from the example of unemployment?
A.
The sense of happiness of the Unemployed people partly depends on where he stays.
B.
Generally speaking, unemployed people are happier than those who have jobs.
C.
In an area where everyone has a job, it's easy to get unemployed.
D.
Unemployed people usually stay in an area of high unemployment.
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