Неметаллы. Тема 14. Сера. Оксиды серы (IV) и серы (VI)
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![Периодический Закон | ПСХЭ | Таблица Менделеева [Урок 9]](https://sun9-79.userapi.com/fIdgaszn-CFo0qPgaXXci5IVvc_paWYnGfnU0A/s_Xt6jv7-Ns.jpg)
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