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为什么牙膏刷鞋越来越白
更新时间: 2020-11-02 00:00:00  

牙膏刷鞋越来越白因为牙膏起到了增白的作用。牙膏里主要有磨沙剂,即很细小的颗粒,就好像是用沙纸在挫鞋,而且有清洁成分所以鞋子会刷的很白,洗过之后包上纸巾还会更白。纸巾包起来的道理涉及到一个叫做“泳移”的物化常识,所谓泳移就是液体中的固体颗粒会沿着液体挥发的方向移动。

关键词: 为什么 牙膏 越来越

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