题目：
已知：N2(g)+O2(g)=2NO(g) △H=+180kJ/mol，2NO(g)=N2(g)+2O2(g) △H= -67.8 kJ/mol，2NO2(g)=N2O4
(g) △H=-56.9 kJ/mol。则以下反应的焓变△H>0的是 [ ]
A.N2(g)+2O2(g)=N2O4(g)
B.2NO(g)+O2(g)=N2O4(g)
C.4NO(g)=2NO2(g)+N2(g)
D.2NO(g)+O2(g)=2NO2(g)
答案：
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