Emkhiqizweni wezimboni, uwoyela uyisici esibalulekile nesibalulekile.Ukuhlunga uwoyela kuwela ezigabeni ezimbili: 1. Uwoyela ongahluziwe Uwoyela ongahluziwe uyingxube eyinkimbinkimbi equkethe ama-hydrocarbon ahlukahlukene, ama-sulfide, izinhlanganisela ze-nitrogen, njll., ezingadala umonakalo kumishini kanye ...
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