材料...................................................K9 尺寸公差..............................................±0.2mm 角度公差...............................................<10″（使用角） 平面度.................................................λ/8 側垂..................................................5′ 有效孔徑..............................................> 90%光潔度................................................40-20 倒邊.................................................<0.2mm 崩邊.................................................< 0.1mm