A.2.8%~93% B.3.2%~64% C.3.5%~16.3% D.15.5%~93.9%
A.减少焊接电流 B.增加焊接速度 C.增加电弧长度 D.严格烘干焊条
A.1.5 B.2 C.2.5 D.3