Cov khoom
Hydraulic Hom Ob Chav Them Tawm Chev
Qhov kev them nyiaj no yog ib qho yooj yim rau kev khiav lag luam thiab tuaj yeem txo qhov kev siv zog ntawm cov neeg ua haujlwm.Nws kuj txhim kho cov khoom tsim tau.Cov hlau tsis yooj yim cuam tshuam thaum lub sij hawm kev kub ceev.