问题
选择题
_____ they arrived early at the airport, they never missed the flight. [ ]
A. If
B. because
C. As soon as
D. although
答案
答案：D
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_____ they arrived early at the airport, they never missed the flight. [ ]
A. If
B. because
C. As soon as
D. although
答案：D
2B（g） ΔH，若正反应的活化能为Ea kJ·mol－1，逆反应的活化能为Eb kJ·mol－1，则ΔH＝（Ea－Eb） kJ·mol－1
始终保持增大