A.15%-30% B.30%-45% C.35%-80% D.45%-90%
A.5CrNiMo B.5CrMnMo C.5CrNiMo和5CrMnMo D.以上答案都不對(duì)
A.GCr15 B.GCr15SiMn C.GCr15和GCr15SiMn D.以上答案都不對(duì)