Ikhoyili efakwe umbala iwumkhiqizo wepuleti elishisayo elinothayela, ipuleti le-zinc elishisayo le-aluminium, ipuleti elenziwe nge-electrogalvanized, njll., ngemva kokwelashwa kwangaphambili kwendawo (ukukhishwa kwamakhemikhali nokwelashwa kokuguqulwa kwamakhemikhali), ijazi...
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