在恒温恒容的密闭体系中，可逆反应：A（s）＋2B（g）
2C（g）；ΔH<0，不能作为该反应达到化学平衡的标志的是
①v正（B）＝v逆（C）②n（B）∶n（C）＝1∶1 ③容器内压强不再改变 ④容器内气体的密度不再改变 ⑤容器内混合气体的平均相对分子质量不再改变
A．②③④⑤ B．②③ C．①③④ D．全部
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