可逆反应a A（s）＋b B（g）
c C（g）＋d D（g），反应过程中，当其它条件不变时，C 的百分含量（C％）与温度（T）和压强（P）的关系如下图下列叙述正确的是 
| A．达平衡后，加入催化剂则C％增大 |
| B．达平衡后，若升温，平衡左移 |
| C．化学方程式中b ＞c +d |
| D．达平衡后，增加A的量有利于平衡向右移动 |
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