Химия, 9 класс, тема “Амфотерные гидроксиды“ (учитель Швецова Елена Евгеньевна)
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![Quando Rondo - Life Goes On [Official Music Video]](https://sun9-27.userapi.com/ziLotuJx2lD349bc5mfCSJxxcDGP2qlRV8ilmg/NybRumsFsbU.jpg)
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