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