已知(l)H2(g)+1/2O2(g)=H2O(g);
已知(l)H2(g)+1/2O2(g)=H2O(g);△H1=akJ/mol
(2)2H2(g)+O2(g)=2H2O(g);△H2=bkJ/mol
(3)H2(g)+1/2O2(g)=H2O(l);△H3=ckJ/mol
(4)2H2(g)+O2(g)=2H2O(l);△H4=dkJ/mol
下列关系式中正确的是()
A.a<c<0B.b>d>0C.2a=b<0D.2c=d>0