高炉炼铁过程中发生的反应：
Fe2O3(s)＋CO(g)
Fe(s)＋CO2(g)，已知该反应在不同温度下的平衡常数如下
| 温度/℃ |
1000 |
1150 |
1300 |
| 平衡常数 |
4.0 |
3.7 |
3.5 |
下列说法正确的是
A．该反应的△H<0
B．该反应的平衡常数表达式是K=
C．降低温度将缩短反应达到平衡的时间
D．其他条件不变，升高温度，可以提高CO的平衡转化率
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