GB/T 43492-2023预制保温球墨铸铁管、管件和附件国家标准
英文:Thermal preinsulated ductile iron pipes, fittings and accessories GB/T 43492-2023介绍: 国家标准《预制保温球墨铸铁管、管件和附件》由TC183(全国钢标...
英文:Thermal preinsulated ductile iron pipes, fittings and accessories GB/T 43492-2023介绍: 国家标准《预制保温球墨铸铁管、管件和附件》由TC183(全国钢标...