Водный светофор. Делаем тесты воды на окисляемость.
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![[Vlog КНС] Холодный дождь Команды наказания светофоров.](https://sun9-71.userapi.com/OJzBG_4S2tSA5vuG2JylmY--76fCK_PpQUkPLw/sO6cJ5g-xPo.jpg)
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