1. Ingakwazi ukuhlangabezana nezidingo zokuvikela ezihlukene zempahla.Izikhwama zokupakisha ukudla azikwazi nje ukuhlangabezana nezidingo zokuvimbela umhwamuko wamanzi, igesi, amafutha, izinyibilikisi eziphilayo nezinye izinto, kodwa futhi zihlangabezana nezidingo zamakhasimende, ezifana nokugqwala, ukulwa nokugqwala, i-anti-electromagnetic ra...
Funda kabanzi