The center of the Otis is a cylinder, a sphere, a sphere, a sphere, a sphere, a hole, a hole, a hole, a hole, a hole, a hole, a hole, a hole, a hole, a hole, a hole, a hole, a hole, a hole, a hole, a hole, a hole, a hole, a hole, a hole, a hole, a hole, a hole, a hole
欧帝斯中心冲圆柱冲圆锥冲样冲尖冲定位冲子尖凿锥形打眼冲中心孔