题目

已知(1)H2(g)+O2(g)H2O(g)；ΔH1=a kJ·mol-1(2)2H2(g)+O2(g)2H2O(g)；ΔH2=b kJ·mol-1(3)H2(g)+O2(g)H2O(1)；ΔH3=c kJ·mol-1(4)2H2(g)+O2(g)2H2O(1)；ΔH4=d kJ·mol-1    下列关系式中正确的是(    )A.a＜c＜0             B.2a=b＜0           C.b＞d＞0                D.2c=d＞0 答案：B

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