下列热化学方程式中△H的绝对值能表示可燃物燃烧热的是( )A.H2(g)+Cl2(g)═2HCl(g);△H=-184.6kJ/molB.CO(g)+12O2(g)═CO2(g);△H=-283kJ/molC.2H2(g)+O2(g)═2H2O(l);△H=-571.6kJ/molD.CH4(g)+2O2(g)═CO2(g)+2H2O(g);△H=-802.3kJ/mol