单项选择题
The correct statement in the following statements is ()
A．The heat of formation of H2O(l) is the heat of combustion of H2B．The heat of formation of H2O(g) is the heat of combustion of H2
C．Heat of formation of H2O(l) is the heat of combustion of O2
D．The heat of formation of H2O(g) is the heat of combustion of O2
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