Конические сечения: эллипс, парабола и гипербола // Борис Трушин
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![Конусная дробилка CC [анимация] Принцип работы конусной дробилки . Процесс вид в разрезе.](https://sun9-79.userapi.com/0OZ8Vdg84Rl-ubRe5bCkrLRiK-7QVdIV1r3CIA/-zitsFfzJyg.jpg)
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