ICS 47.020.30CCS U 55中华人民共和国国家标准GB/T 17727—2024船用法兰非金属垫片Nonmetal material gaskets for marine flange代替 GB/T 17727—20172024-08-23 发布2024-12-01 实施国家市场监督管理总局国家标准化管理委员会发 布目　　次前言 ·····························································...