A.分段退焊B.連續(xù)焊C.點(diǎn)焊D.打底焊
A.1~1.5sB.1.5~2.5sC.1.2~2.5sD.2.5~3.5s
A.80°~85°B.15°~45°C.45°~60°D.60°~75°