Ukhonkolo uyinto evamile yokwakha ethwala imithwalo esetshenziswa namuhla ehlanganisa usimende, amanzi, isamba, izithasiselo zamakhemikhali, nezithako zamaminerali ngenxa yezici zayo ezinjengokuthengeka, ukumelana nokucindezela okuphezulu, ukusetshenziswa okuhlala isikhathi eside, nokubunjwa kalula. . Izinga lale nto, w...
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