【化】 单梁自行式起重机

travel crane operational travel air travel pad travel travel chart backward travel punch travel travel bag travel industry armature travel travel agency single-beam electric crane single-beam crane electric single beam crane electric single-beam bridge crane single-beam electric hook crane travel crane electric travel(l)ing crane grapnel travel(l)ing crane single beam shaft-driven travel(l)ing crane one-motor travel(1)ing crane