Фрагмент занятия в коллективе Серпантин
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![[Физика. Global_EE. Банк заданий] Горизонтальная поверхность разделена на две части: гладкую и шероховатую. На границе этих - №3](https://sun9-45.userapi.com/impg/DGhBgk50ouTFneK6dw-VYQYuwsvGKMFg0uZfQg/fYPgKSH4aqg.jpg?size=320x240&quality=95&keep_aspect_ratio=1&background=000000&sign=552a0f63d177b48071929d78486f2c4a&c_uniq_tag=9mOTLT7bc8Cy45bOTdW8BPtqY8ZciNSrvHXEYmdRiAQ&type=video_thumb)
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