Гелий и Гексафторид серы
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7 years ago 00:04:57 116.4K
![Гелий [Периодическая таблица видео]](https://sun9-29.userapi.com/c840527/v840527972/32130/MWxaq6PTTKY.jpg)
8 years ago 00:00:39 20.4K
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10 years ago 00:01:31 54