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【单选题】
下列药物中其反式异构体有效,顺式异构体无效的是A.
双炔失碳酯
B.
己烯雌酚
C.
司酮
D.
左炔诺孕酮
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【单选题】Which energy change corresponds to the enthalpy change of atomisation of hydrogen at 298 K?
A.
.the bond energy of a H – H bond
B.
.half the bond energy of a H – H bond
C.
.minus half the bond energy of a H – H bond
D.
.minus the bond energy of a H – H bond
【单选题】Which of the following is true according to the passage?
A.
Man's energy cycle can be changed easily.
B.
Some family quarrels are caused by unawareness of energy cycle.
C.
Getting up early in the morning is not easy.
D.
Everyone has a daily energy cycle but a lazy one.
【简答题】进气道的作用？什么是进气道总压恢复系数？
【多选题】The standard free-energy change (△G'°) tells us in which direction and how far a given reaction must go to reach equilibrium when ______________________________.
A.
the initial concentration of each component is 1.0 M
B.
the pH is 7.0
C.
the temperature is 25 °C
D.
the pressure is 101.3 kPa (1 atm).
【单选题】Which energy change corresponds to the electron affinity of fluorine?
A.
2
B.
5
C.
4
D.
1
E.
6
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