Радиоактивность Виды радиоактивных излучений Урок 111
2 months ago 00:55:10 1
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2 months ago 01:19:55 5
3 months ago 00:26:27 1
![☢ Село Ширяевка. Радиация есть и есть интерес. [Сергей Белкин].](https://sun9-31.userapi.com/vvNpjQhC3vag8jH85-P_Zjh3Ty2TQ8dmTnQ1kA/5FYyxuHlAM8.jpg)
3 months ago 02:12:59 1
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4 months ago 00:12:11 1
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4 months ago 00:03:27 1
