问题
选择题
My father is very pessimistic my chances of getting a good job. [ ]
A. on
B. of
C. about
D. in
答案
答案：C
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My father is very pessimistic my chances of getting a good job. [ ]
A. on
B. of
C. about
D. in
答案：C
2NH3(g) ΔH="-92.4" kJ·mol-1,则N≡N键的键能是( )