hoarfrost point

... hitting point || 弹着点弹着点 hoarfrost point || 结霜点 hob || ①螺旋铣刀，齿轮滚铣刀，滚铣刀，滚刀②滚铣，滚齿③蜗杆，螺杆，冲头④挤圧母模 ...