某温度下，在一个2 L的密闭容器中，加入4 mol A和2 mol B进行如下反应：3A（g）＋2B（g）
4C（s）＋2D（g），反应一段时间后达到平衡，测得生成1.6 mol C，则下列说法正确的是
A．该反应的化学平衡常数表达式是K＝ |
| B．此时，B的平衡转化率是40% |
| C．增大该体系的压强，化学平衡常数增大 |
| D．增加B，B的平衡转化率增大 |
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