1. Isethulo sensimbi engagqwali Insimbi engagqwali iwuhlobo lwensimbi engagqwali, ikakhulukazi eyakhiwe ngensimbi, i-chromium, i-nickel nezinye izakhi, enezici ezinhle zemishini, ukuqina, ipulasitiki kanye nokumelana nokugqwala. Ifilimu ye-chromium oxide...
Funda kabanzi