短语词组短语truss -bolt system 锚拉支架系统truss bolt west bank 桁架螺栓king bolt truss 钢吊杆桁架king bolt bush bolt truss 钢吊杆桁架king bolt bush truss 有中柱的桁构bolt welding truss 栓焊桁梁桥 返回 truss bolt