Hom hlau hlau muaj galvanized dub hlau, galvanized hlau hlau thiab txheej txheem hlau hlau, galvanized dub hlau yog dab tsi?Dab tsi yog cov txheej txheem ntawm galvanized dub hlau?Dab tsi yog kev siv ntau?Cov khoom tseem ceeb ntawm galvanized dub hlau yog hlau, cobalt, npib tsib xee, tooj liab, carbon, zinc thiab ...
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