Izinto ezichaphazela ukuchaneka komngxuma owenziwe ngoomatshini ngexesha lokomba: ①Ukuchaneka kokucofa kunye neemeko zokusika intwana yokomba, njengomphathi wesixhobo, isantya sokusika, isantya sokutya, ukusika ulwelo, njl.njl.;②Ubungakanani kunye nokumila kwesuntswana le-drill, njengobude be-drill bit, imilo yeblad...
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