Gantry Crane yog ib qho deformation ntawm ib coehead crane {}} Nws yog cov hlau txuas rau hauv av, thiab ob qho kawg ntawm cov nqaj tseem muaj zog cantilever cov teeb ua paug {3} antry cranes muaj cov yam ntxwv ntawm cov khoom siv siab, dav dav siv hauv chaw nres nkoj freight yards {}}












