一定温度下，可逆反应3X(g)+Y(g) 
2Z(g)达到平衡的标志是（ ）
| A．单位时间内生成3n mol X，同时消耗n mol Y |
| B．X的生成速率与Z的生成速率相等 |
| C．X、Y、Z的浓度相等 |
| D．X、Y、Z的分子个数比为3:1:2 |
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