Почему социальная вода зеленеет и покрывается пленкой?
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![Как устроен QR-код? [Veritasium]](https://sun9-17.userapi.com/vMRqlqbLXQugziWjeg0MGg6vB7a4YiL40h3MWw/lLA9V_KEgz0.jpg)
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![ЕЖЕДНЕВНЫЕ ОБЯЗАТЕЛЬНЫЕ МЕРОПРИЯТИЯ, СКОЛЬКО, КОГДА И КАК ДЕЛАТЬ.[Шишова О.И.]](https://sun9-60.userapi.com/wfOILr8cWLp4sYOt-py_AwUhHgXpD9kwf8uoIg/TM2TVQ1d5Rs.jpg)
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