dn25镀锌钢管外径是多少(dn25镀锌管内径多大)

DN25热镀锌钢管外径多少镀锌管外径规格焊管（6米定尺）镀锌管(6米定尺）公称内径英寸外径mmDN151/221.3DN203/426.9DN25133.7DN321.2542.DN401.548.3DN50260.DN652.576.1DN80388.9DN1004114.3DN1255140D.