题干
—The opening ceremony of the Cultural Festival was the most exciting, wasn't it?
—________. I had never seen a better one before.
A：No problem
B：Not really
C：Forget it
D：You bet
答案(点此获取答案解析）
D
N2O4(g)(正反应是放热反应)。在测定NO2的相对分子质量时，下列条件中较为适宜的是