GB/T 38097-2019城镇供热玻璃纤维增强塑料外护层聚氨酯泡沫塑料预制直埋保温管及管件国家标准
英文:Urban heating—Prefabricated directly buried insulating pipes and fittings with polyurethane(PUR) foamed-plastics and ...
英文:Urban heating—Prefabricated directly buried insulating pipes and fittings with polyurethane(PUR) foamed-plastics and ...