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【单选题】
下列关于纯组分和双组分P-T相图描述不正确的是——A.
对于单组分体系，其气、液两相能够共存的区域是一条线，即饱和蒸汽压线
B.
对任何单组分来说，饱和蒸汽压线实际就是该组分的泡点线和露点线的共同轨迹线
C.
两组分体系相图泡点线和露点线不重合，两线所包围区域即为两相区
D.
两组分体系相图中临界点所对应的温度和压力是气、液两相能够共存的最高温度点和 最高压力点
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