—Excuse me, may I take a seat here? —_________ The man on the seat has left. A.Yes, please. B. No, thanks. C. I'm afraid not. D. You'd better not. 答案:A右图表示反应N2(g)+3H2(g)2NH3(g); ΔH=-92.2kJ/mol。 在某段时间t0~ t6中反应速率与反应过程的曲线图,则氨的百分含量最高的一段时间是 ( )A、t0—t1 B t2—t3 C t3—t4 D t5—t6