upside-down counter-bore的意思|示意
美 / /
英 / /
乱七八糟的沉孔
upside-down counter-bore的网络常见释义
倒置柱坑钻 ... 杆端锻粗机 upsetting machine 倒置柱坑钻 upside-down counter-bore 上游 upstream ...