埋地钢质管道聚乙烯防腐层GB-T23257-2009[1]VIP

前言本标准的附录A、附录B、附录C、附录D、附录E、附录F、附录G、附录H、附录I、附录J、附录K、附录L、附录M、附录N为规范性附录。本标准由...