A.在任意300mm測量長度上允差0.02mm B.在任意400mm測量長度上允差0.025mm C.在任意300mm測量長度上允差0.05mm D.在任意300mm測量長度上允差0.025mm
A.高速鋼 B.硬質(zhì)合金 C.不銹鋼 D.碳素工具鋼