在一定温度下的恒容容器中，当下列物理量不再发生变化时，表明反

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在一定温度下的恒容容器中，当下列物理量不再发生变化时，表明反应：A_(s)+3B_(g)2C_(g)＋D_(g) 已达平衡状态的是（    ）
　 A．混合气体的压强不随时间变化    B．B的生成速率和D的反应反应速率为3︰1
　 C．混合气体的密度不随时间变化    D．B、C、D的分子数之比为3︰2︰1

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