Химия 8 класс Урок№6 Валентность химических элементов
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![Marriage and the Family [What Does God Intend Them to Be?] – Pastor Ted Wilson](https://sun9-2.userapi.com/S-WhYoHwRfUxxei7-pFEKnBdfAgKPlJsVa4kWA/jUpzQlUzvC4.jpg)
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