下列热化学方程式中,能表示可燃物的燃烧热的是( )A.C(s)+12O2(g)═CO(g)△H=-110.5J?mol-1B.CH4(g)+2O2(g)═CO2(g)+2H2O(g)△H=-802.3kJ?mol-1C.2H2(g)+O2(g)═2H2O(l)△H=-571.6kJ?mol-1D.CO(g)+12O2(g)═CO2(g)△H=-283kJ?mol-1