美利体育登录入口官网:PREN 488-2018
区域供热管道 用于直埋热水网络的粘合单管系统 工厂制造的用于钢制服务管道的钢制阀门组件 聚氨酯隔热层和聚乙烯外壳
District heating pipes - Bonded single pipe systems for directly buried hot water networks - Factory made steel valve assembly for steel service pipes@ polyurethane thermal insulation and a casing of polyethylene