Inqola yangaphansi yenza imisebenzi yokweseka nokushayela, Ngakho-ke, inqola yangaphansi kufanele yakhelwe ukuthi ihambisane nalokhu okulandelayo: 1) Amandla okushayela aqinile ayadingeka ukuze injini ikwazi ukudlula, ukwenyuka, nokuqondisa lapho ihamba. ..
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