Kwezinye izindawo lapho uthuli oluvuthayo lukhiqizwa ku-metallurgy, amalahle, imboni yamakhemikhali, i-electroplating, ukupholisha, ukucubungula ukudla nezinye izimboni, izindawo ezigcwele uthuli zivame ukwenzeka.Ngakho-ke, ukukhetha imishini yokungenisa umoya engcono kuzothuthukisa imvelo...
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