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【单选题】
在288K时H2O(l)的饱和蒸气压为1702Pa, 0.6mol的不挥发性溶质B溶于0.540kg H2O时，蒸气压下降42Pa，溶液中H2O的活度系数γx应该为
A.
0.9804
B.
0.9753
C.
1.005
D.
0.9948
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