A.1.2%~1.3% B.1.3%~1.4% C.1.2%~1.5% D.2.0%以上
A.折疊 B.錯(cuò)移 C.不滿模 D.裂紋
A.碳素鋼 B.合金鋼 C.高合金鋼 D.合金結(jié)構(gòu)鋼