(DN300的无缝钢管一根是多长)
DN25ф34mm,DN32ф42mmDN40ф48mm,DN50ф60mmDN65ф7673mm,DN80ф89mmDN100ф114mm,DN125ф140mmDN150ф168mm,DN200ф219mmDN250ф273mm,DN300ф324mmDN350ф360mm,DN400ф。DN30...
DN25ф34mm,DN32ф42mmDN40ф48mm,DN50ф60mmDN65ф7673mm,DN80ф89mmDN100ф114mm,DN125ф140mmDN150ф168mm,DN200ф219mmDN250ф273mm,DN300ф324mmDN350ф360mm,DN400ф。DN30...