短语词组短語truss -bolt system 錨拉支架系統truss bolt west bank 桁架螺栓king bolt truss 鋼吊杆桁架king bolt bush bolt truss 鋼吊杆桁架king bolt bush truss 有中柱的桁搆bolt welding truss 栓銲桁梁橋 返回 truss bolt