机械加工的气门座锒块
machined valve seat insert
机械加工的转向油缸安装表面
machined steering cylinder mounting surface
螺纹加工的编程方法
Programming Methods of Screw Production
难加工的材料
difficult to machine material
农业加工的废弃物
offal of agricultural machining
食品加工的副产品加工与利用
by-product processing and application in food proc