I-drill bit ebukhali ngundoqo ekusebenzeni kakuhle, ukuchaneka, kunye nokuphila ixesha elide kuwo nawuphi na umsebenzi wokomba. Nokuba kukwimizi-mveliso, ukwenza isinyithi, okanye ulwakhiwo, ukugcina amasuntswana alolwe kakuhle kuqinisekisa ukusikeka okucocekileyo, ukugrumba ngokukhawuleza, kunye nokunciphisa...
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