Урок 107 (осн). Виды теплопередачи (часть 2)
Урок физики в Ришельевском лицее
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![Предыстория войны. Рождение «народных республик» [документальный фильм]](https://sun9-5.userapi.com/278rIK7jg29npHdpHt0go9Y_tDH3A3y23PFmhw/eKI_kvoKOrM.jpg)
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