right-and-left nut牵紧螺母
right-and-left threaded正反螺纹的;左右螺纹的
Right-and-left symmetrical point左右对称点
right-and-left effect从右到左的效果
right-and-left screw左右旋螺栓
right-and-left-handcore左右对称泥芯
right-and-left scre左右旋螺栓
right-and-left-hand core左右对称泥芯
right-and-left-hand-screw clip左右向螺杆夹