Посмотрите какие талантливые и добрые у нас подписчики, мы с доктором Василием ПРИНИМАЕМ ПОДАРКИ )))
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![Периодическое изменение свойств химических элементов в ПСХЭ |Таблица Менделеева [Урок 10]](https://sun9-1.userapi.com/fNv27d7GbcIRknpHtMsHZRjutAqBvQ0izzF8Xg/eFHdYFaW-fc.jpg)
2 months ago 00:12:28 1
