A.Q345 B.20g C.1Crl8Ni9Ti D.0G13
A.角焊縫加對(duì)接焊縫 B.角焊縫加端接焊縫 C.對(duì)接焊縫加端接焊縫 D.端接焊縫加塞焊縫
A.適用于 B.不適用 C.對(duì)碳素鋼適用 D.對(duì)不銹鋼不適用