Steel profiles, raws li lub npe qhia, yog hlau nrog ib tug tej yam geometric duab, uas yog ua los ntawm steel los ntawm dov, foundation, casting thiab lwm yam txheej txheem. Txhawm rau kom ua tau raws li qhov xav tau sib txawv, nws tau ua rau hauv cov duab sib txawv xws li I-steel, H steel, Ang ...
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