下列热化学方程式中 ΔH的数值能表示可燃烧热的是 

A．H2(g) + Cl2(g) =" 2HCl(g)" ΔH =－184.6kJ/mol

B．CH4(g) + 2O2(g) = CO2(g) + 2H2O(g)ΔH =－802.3kJ/mol

C．2H2(g) + O2(g) = 2H2O(l)ΔH =－571.6kJ/mol

D．CO(g) + 1/2O2(g) = CO2(g)ΔH =－283kJ/mol