Ib qho: seem steel. Raws li cov duab ntawm seem, nws tuaj yeem muab faib ua cov hlau puag ncig, tiaj tus hlau, square steel, hexagonal steel, octagonal steel, lub kaum sab xis steel, I-beam, channel steel, T-shaped steel, B-shaped steel, thiab lwm yam. Ob: steel phaj! Hlau phaj (thickness $% mm) thiab nyias hlau ...
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