下列热化学方程式中的反应热下划线处表示燃烧热的是
A．NH3（g）+ O2（g）═NO（g）+ H2O（g）；△H=﹣akJ•mol﹣1 |
| B．C6H12O6（s）+6O2（g）═6CO2（g）+6H2O（l）；△H=﹣bkJ•mol﹣1 |
| C．2CO（g）+O2（g）═2CO2（g）；△H=﹣ckJ•mol﹣1 |
D．CH3CH2OH（l）+ O2（g）═CH3CHO（l）+H2O（l）；△H=﹣dkJ•mol﹣1 |
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