單項(xiàng)選擇題
A.9% B.0.9% C.0.09% D.0.009%
A.40% B.4% C.0.4% D.0.04%
A.45%B.4.5%C.0.45%D.0.045%
A.滲碳、淬火加低溫回火 B.調(diào)質(zhì) C.淬火加中溫回火 D.淬火
A.45鋼 B.60Si2Mn C.08F鋼 D.T12
A.45鋼 B.65鋼 C.08F鋼 D.T12
A.合金鋼 B.優(yōu)質(zhì)碳素結(jié)構(gòu)鋼 C.碳素工具鋼 D.鑄鋼
A.低碳鋼 B.中碳鋼 C.高碳鋼 D.合金鋼