A.增加 B.減少 C.固定不變 D.施工單位自行確定
A.電弧焊 B.閃光對(duì)焊 C.電渣壓力焊 D.搭接焊 E.電阻點(diǎn)焊
A.120mm B.80mm C.60mm D.100mm