A.氣門與氣門座互研 B.氣門研磨機(jī)研磨 C.氣門座鉸削 D.氣門座的手工研磨
A.氣門座的光磨 B.氣門座的鉸削 C.氣門與氣門座互研 D.氣門研磨機(jī)研磨
A.75° B.45° C.30° D.15°