25℃、1.01×105 Pa时，下列哪个反应放出的热量能表示乙炔的燃烧热 ( )
| A．2C2H2(g)＋5O2(g)===4CO2(g)＋2H2O(g) |
B．C2H2(g)＋ O2(g)===2CO2(g)＋H2O(l) |
C．C2H2(g)＋ O2(g)===2CO(g)＋H2O(g) |
| D．C2H2(g)＋O2(g)===2CO(g)＋H2O(l) |
25℃、1.01×105 Pa时，下列哪个反应放出的热量能表示乙炔的燃烧热 ( )
| A．2C2H2(g)＋5O2(g)===4CO2(g)＋2H2O(g) |
| B．C2H2(g)＋O2(g)===2CO2(g)＋H2O(l) |
| C．C2H2(g)＋O2(g)===2CO(g)＋H2O(g) |
| D．C2H2(g)＋O2(g)===2CO(g)＋H2O(l) |
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