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【单选题】
恒沸组成和温度与压力的关系是( )。
A.
恒沸温度和组成随压力变化而变化
B.
恒沸温度和组成不随压力变化
C.
恒沸温度随压力变化，而组成不变化
D.
组成随压力变化，恒沸温度不变化
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