Определение твердости материалов по методу Бринелля
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![[C] и [С’] определяем твёрдость и мягкость](https://sun9-78.userapi.com/5stu0WE7fn5-D9gkM58DmiYnkXGVs5gA8TSUqw/HhaWAM_nMpc.jpg)
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