JCS77.140.75CCSH48GB中华人民共和国国家标准GB/T28897一2021代替CB/T28897一2012流体输送用钢塑复合管及管件Steel-plasticcompoundpipesan...
GBT28897-2021(代替GBT28897-2012)流体输送用钢塑复合管及管件.pdf