题干
We can hardly ________ what he really means on this controversial problem, as he doesn’t show his clear stand to anyone of us.
A：stick out
B：let out
C：try out
D：figure out
答案(点此获取答案解析）
D
2NH3的正、逆反应速率可用各反应物或生成物浓度的变化来表示。下列各关系中能说明反应已达到平衡状态的是