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【单选题】
在一定温度下，向a L密闭容器中加入1 mol X和2mol Y，发生如下反应： X(s) + 2Y(g) 2Z(g) 此反应达到平衡的标志是A.
容器内压强不随时间变化
B.
容器内各物质的浓度不随时间变化
C.
容器内X、Y、Z的浓度之比为l : 2 : 2
D.
单位时间消耗0.1 mol X同时生成0.2 mol Z
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