已知下列热化学方程式: 1N 2 (g)+2O 2 (g)=2NO 2 (g) △H 1 = a 2N 2 H 4 (g)+O 2 (g)=N 2 (g)+2H 2 O(l) △H 2 = b 则 2N 2 H 4 (g)+2NO 2 (g)=3N 2 (g)+4H 2 O(l) △H=_______kJ/mol (要求用含有 a 、 b 的代数式表示)
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【单选题】While it is essential that the text covers the subject adequately, it is also important that it is neither too detailed or too complex for the intended reader.
【单选题】While fashion is thought of usually in relation to clothing, it is important to realize that it covers a much wider domain. It is to be found in manners, the arts, literature, and philosophy, and may ...
A.
fashion operates in every society
B.
fashion can be found only in a few fields of group life
C.
fashion originates in a class society
D.
people like to keep up with fashion in a primitive society