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Biến dạng dàn hồi của vật rắn là gì? viết công thức xác định ứng suất và nói rõ đơn vị đo của nó
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Biến dạng dàn hồi của vật rắn là gì? viết công thức xác định ứng suất và nói rõ đơn vị đo của nó...
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