A.立焊→平焊→仰焊 B.仰焊→平焊→立焊 C.仰焊→立焊→平焊 D.平焊→仰焊→立焊
A.1 B.2 C.3 D.5
A.原始數(shù)據(jù) B.參考數(shù)據(jù) C.標準數(shù)據(jù) D.沒有實際價值數(shù)據(jù)