Cov tsiaj tawb feem ntau yog ua los ntawm cov hlau zoo hlau, cov hlau tsis muaj cov hlau tsis zoo, cov hlau tsis muaj steel hlau vuam, uas yog cov yam ntxwv zoo nkauj, hnav, folding, yooj yim rau khaws cia.Kev kho deg ntawm cov tsiaj tawb yog feem ntau: txias galvanized, kub galvanized, tshuaj tsuag, dip, chromium plating, nicke ...
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