Hardly had I ______when the play began. 发布时间:2017-05-13 15:36 │ 来源:www.tikuol.com 题型:选择题 问题: Hardly had I ______when the play began.A.seatedB.been satC.sitedD.been seated
题型:选择题 下列各组热化学方程式中,△H前者大于后者的是①C(s)+O2(g)=CO2(g); C(s)+1/2O2(g)=CO(g)②S(s)+O2(g)=SO2(g); S(g)+O2(g)=SO2(g)③H2(s)+1/2O2(g)=H2O(l); 2H2(g)+O2(g)=2H2O(l)④2KOH (aq) +H2SO4(aq)=K2SO4(aq)+2H2O (l);2KOH (aq) +H2SO4(浓)=K2SO4(aq)+2H2O (l)A.①③B.②④C.②③④D.①②③ 查看答案