Nyiaj siv ua haujlwm crane nqe 5 tuj ib qho nyiaj
LD Ib qho ntawm tus kheej yog siv cov khoom siv ua lag luam, roj av, petroleum, riam phom metallurgical, ports, ntawv ua, cov khoom siv hauv tsev, hluav taws xob thiab lwm cov hauj lwm kev lag luam, warehouses, yard, lub cav me me, thiab lwm yam.
