短语词组短语Lead of screw 螺旋导程hydrostatic lead -screw 液静压导螺杆lead protection screw tester 丝杆检查仪lead -screw grinding 丝杠螺纹磨削lead protection screw 导螺杆lead 1 screw 导螺杆lead of screw thread 螺纹导程 返回 lead screw