在密闭容器中一定量混合气体发生反应：2A (g) + B (g))
xC（g），达到平衡时测得 A的浓度为 0.5 mol/L，在温度不变的条件下，将容器的容积扩大到原来的2倍， 再达平衡时测得A的浓度为 0.3 mol/L ，下列有关判断正确的是
| A．x = 3 | B．平衡向正反应方向移动 |
| C．B的转化率降低 | D．C的体积分数增大 |
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