A.0.1~1.2mm B.0.2~12mm C.0.3~1.2mm D.0.5~1.2mm
A.臺(tái)金滲透鋼20CrMnMoA B.鑄鋼 C.優(yōu)質(zhì)合金鋼 D.鑄鐵
A.128mm B.139mm C.146mm D.150mm