Ib Leeg Hlau Foob
Cov hlau ntsaws ruaj ruaj los yog cable ntsaws ruaj ruaj yog txwv rau cov ntsaws ruaj ruaj.Ib Leeg Hlau Foob (SWS) yog peb cov khoom tseem ceeb, thiab muaj ntau tshaj 300 qhov tshwj xeeb raws li qhov sib txawv ntawm cov rwb thaiv tsev diameters, borehole Diameters, Sab nraud Diameters, Ntev thiab xim.