在一个不传热且容积固定的密闭反应器里，有可逆反应：mA(g) + nB(g) 
pC(g)+qD(g) 当m、n、p、q为任意正整数时，该反应达到平衡的标志是( )
①体系的压强不再发生变化；
②体系的温度不再发生变化；
③各组分的物质的量浓度不再发生变化；
④各组分的质量分数不再发生变化；
⑤反应速率γA：γB： γC： γD = m：n：p：q；
⑥单位时间内，若消耗了m mol A物质，同时也消耗了qmolD物质
| A．①③⑤ | B．①④⑥ | C．②③④⑥ | D．③④⑤⑥ |
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