hat
5.forage machin lan adopte nouvo dlo freinage ekipman, e se yon jan de mekanik aparèy pou ajiste ordre vitès de forage sistèm lè forage sistèm an desann nan forage pwosesis de forage machin lan.
eng
5.The drilling machine adopts new water braking device, and is a kind of mechanical device to adjust the descending speed of the drilling device when the drilling device descends in drilling process of the drilling machine.