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39[单选题]
R-K方程、P-R方程等是实用的立方型方程,对于摩尔体积V存在三个实根或者一个实根,当存在一个实根V值(其余二根为虚根)时,V值是


A.饱和液体体积

B.饱和蒸汽体积


C.过热蒸汽


D.过冷液体


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