已知氧气、氮气和氨气的沸点分别为：-183℃、-196℃和-33.5℃，将三种气体在常温下混合后逐渐降温至-150℃，在降温的过程中，它们液化的先后次序是（）A．氨、氧、氮B．氮、氧、氨C．-物理

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