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17. ОГЭ по химии 2018 (вариант 18,19)
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12/23/20
Имела ввиду, что О3 молекулярного строения, в отличие от Si, а не двухатомная молекула, конечно)
Продолжаем подготовку к ОГЭ по химии 2018!
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