NoHluav Taws Xob Houghyog ib qho khoom siv nqa tau ntau yam uas yuav siv tau rau ntau yam kev tsim kho thiab rub tawm, thiab hloov chaw, thiab lwm yam haujlwm hauv tsev. txhawb nqa ntau hom kev ua haujlwm, xws li Ntsug Lifting (rau cov khoom hloov chaw), rau cov kab rov tav kev ua haujlwm (rau ntawm cov hlua hlau sib txuas {.
Qhov siab tshaj plaws load-bearing muaj peev xwm ncav cuag 2}}}}}}}}}}}}}}} Cov cuab yeej ntev tshaj li 30 meTers) Ntaus .
