Rov qab Circulation RC drilling hammers thiab rauj laum khoom muab kev ua tau zoo nrog rau kev ntseeg tau zoo thiab yooj yim.Peb cov thwj rov qab rov qab rauj yog tsim rau txhua qhov kev tshawb nrhiav thiab qib tswj cov txheej txheem kom tau txais cov qauv raug tsis muaj paug.RC drilling hammers tuaj yeem nyob rau hauv feem ntau ua cov qauv sau tas li nyob rau hauv ib feem ntawm lub sijhawm tsim nyog nrog cov pa los yog xaim coring.
