A.HQ B.HD C.HWZ D.HWS
A.氣焊 B.焊條電弧焊 C.鎢極氬弧焊 D.電子束焊
A.停弧點(diǎn)后10-20mm B.?;↑c(diǎn)后30-50mm C.在停弧點(diǎn) D.在?;↑c(diǎn)后