题干
―Where did you get to know her?
―It was on the farm we both once worked in the 1970s.
―It was on the farm we both once worked in the 1970s.
A：that
B：which
C：whe
D：where
答案(点此获取答案解析）
D
O2（g）＋2NO（g）；ΔH＞0，达到平衡时，若改变其中一个条件X，Y随X的变化符合图中曲线的是