A.40g/m B.60g/m C.20g/m D.80g/m
A.A=δb+(2/3)hc B.A=δb+(1/3)hc C.A=δb+(1/2)hc D.A=δb+(1/4)hc
A.焊條轉(zhuǎn)熔系數(shù) B.焊縫長(zhǎng)度 C.焊條損失系數(shù) D.焊縫橫截面積