Физика. 8 класс. Урок 13. Закон сохранения и превращения энергии в механических и тепловых процессах.
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![Led Zeppelin - Physical Graffiti {Remastered} [Full Album] (HQ)](https://sun9-9.userapi.com/mIMyPKD963WFzPpeekV7EV-E9hY69aeZ90Co3g/GM-2makIUUQ.jpg)
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