Сравниваем речную и водопроводную воду
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![Панорамное изображение кратера Бельва от марсохода Perseverance [новости науки и космоса]](https://sun9-5.userapi.com/hpAELFBBizRmRm3doAVaXhYN-BWsXdhlwd6lNg/VOf8Pg9q1hc.jpg)
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