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【单选题】
在固定容积的密闭容器中，氮气和氢气合成氨的反应达到了平衡，此时容器中含有0.1molN 2 、0.3mol H 2 、0.2molNH 3 。若维持原来的条件，向该容器中再同时加入0.1molN 2 、0.3molH 2 、0.2molNH 3 ，则 [     ]
A.
正、逆反应速率同时增大，化学平衡不移动
B.
正、逆反应速率同时增大，平衡混合气中NH 3 的体积分数增大
C.
正、逆反应速率同时增大，化学平衡向逆反应方向移动
D.
正逆反应速率不变，化学平衡不移动
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