我们每天喝的水里都有什么？

in water •  10 months ago 

成分有：H₂O,其他成分.氟化物,钠,砷,铅,氯.如果不确定水的安全性，可以将它煮开之后再使用。煮开可以过滤掉会使人生病的细菌、病毒和其他有机体。

water
10 months ago by

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