I-down-the-hole drilling rig iyithuluzi elisetshenziselwa ukumba imithombo yamanzi engaphansi komhlaba noma ukwakheka kwamatshe.Imithombo yamanzi angaphansi komhlaba ingamanzi agcinwe ngaphansi kokwakheka kwamadwala.Ivamise ukutholakala ezimbotsheni zenhlabathi, emifantwini, nasezimbotsheni zamatshe, futhi ingavunwa ngezinto ezifana nemithombo, imithombo, negr...
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