A.HT150 B.QT600-2 C.RuT260 D.以上答案都不對(duì)
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)