A.焊條電弧焊 B.二氧化碳?xì)獗:?br /> C.埋弧焊 D.氬弧焊
A.0.01% B.0.02% C.0.10% D.0.30%
A.45 B.12CrlMoV C.1Crl8Ni9Ti D.18MnMoNb