Lub zog coated steel purlin yog ua los ntawm galvanized purlins (C-section steel, Z-section steel) raws li cov khoom siv hauv paus.Tom qab nias, qhov ua, txiav thiab tsim, epoxy resin hmoov yog preheated ntawm qhov kub thiab txias kom dipped thiab hloov, thiab tom qab ntawd ua tiav los ntawm kev kho ...
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