Разбор задач с Чемпионата ПГНИУ 150619
3 weeks ago 00:00:00 1
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![Пожалуй, главное заблуждение об электричестве [Veritasium]](https://sun9-64.userapi.com/xbFbEDnVxU0mUJ9eBoK8MLJJtrn9qvG45P9C4A/zO8TZ2Logfk.jpg)
3 months ago 00:06:41 1
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