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【简答题】
某种聚合物溶解于两种溶剂A和B中，渗透压π和浓度c的关系如图4-4所示。(1)当浓度c→0时，从纵轴上的截距能得到什么?(2)从曲线A的初始直线段的斜率能得到什么?(3)B是哪一类溶剂?
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