A.552732QKT B.752732QKT C.752732QKiT D.752734QKT
A.752732QKT B.752732QKlT C.752734QKT D.552732QKT
A.ZG230-450鑄鋼件 B.高碳鋼 C.20號(hào)鍛鋼 D.30號(hào)鍛鋼