GB/T 37263-2018高密度聚乙烯外护管聚氨酯发泡预制直埋保温钢塑复合管国家标准
英文:Prefabricated directly buried insulating plastic-steel-plastic composite pipes with polyurethane [PUR]foamed-plastics...
英文:Prefabricated directly buried insulating plastic-steel-plastic composite pipes with polyurethane [PUR]foamed-plastics...