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304不锈钢薄壁小方管 3*3x4x4x5x5x6*6x7*7x8*8*0.3*1*1.2*1.5mm
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无缝方管钢材25x25方管立柱精密碳钢方管4x4国标方管空心厚壁方管
304 201不锈钢空心小方管3X3 4X4 5X5 6X6 7x7 8x8 9x9 1W0x10 4*
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