dn900的管子外径是多少

1DN300=40MM,DN400=45MM,DN500=55MM,DN600=60MM,DN700=70MM,DN800=80MM,DN900=90MM,DN1000=100MM,DN1100=110MM,DN1200=120MM2III级柔性企口钢筋砼排水管壁厚DN1350=130MM,DN1500=150M...