A.100mm B.110mm C.140mm D.180mm
A.GB/T228-2002 B.GB/T238-2002 C.GB/T238-1999 D.GB/T228-1987
A.電弧焊接頭 B.錐螺紋接頭 C.直螺紋接頭 D.套筒擠壓接頭