File:水質論 2.png
![File:水質論 2.png](https://upload.wikimedia.org/wikipedia/commons/thumb/9/92/%E6%B0%B4%E8%B3%AA%E8%AB%96_2.png/426px-%E6%B0%B4%E8%B3%AA%E8%AB%96_2.png?20240312125044)
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