已知：C（s,金刚石）=C（s,石墨）△H＝-1．9KJ/mol
C（s,金刚石）+O2（g）=CO2（g） △H1
C（s,石墨）+O2（g）=CO2（g） △H2
根据已述反应所得出的结论正确的是
| A．△H1=△H2 | B．△H1>△H2 |
| C．△H1<△H2 | D．金刚石比石墨稳定 |
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