Iqonga elijikelezayo elinomthwalo onzima liqonga elijikelezayo elisebenza ngokugqithisileyo, linomgoqo ojikelezayo kunye nesakhiwo senkxaso yomthwalo, sinesakhiwo esilula, kulula ukuyisebenzisa kunye nokugcinwa, kwiinkalo ezahlukeneyo zisetyenziswa ngokubanzi kwiinkalo ezahlukeneyo zoshishino, ezifana ne: imichiza, i-petroleum, intsimbi kunye nentsimbi, umbane...
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