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... ich starts from the fracture and is surrounded by a layer of sapphire coarse particles.
The surface of the light steel originally had a layer of black anti-rust paint, and now the anti-rust paint is neatly peeled off. In the field of leaf green, these coarse particles are composed of numerous tiny cracks.
This is the most intuitive manifestation of metal fatigue, its internal structure has been destroyed by external forces, and the strength is seriously reduced.
The cause of ...
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