GB/T 41048-2021城镇排水用塑料检查井技术要求标准
英文:Technical requirements for plastics inspection chamber and manhole for urban drainage GB/T 41048-2021介绍: 国家标准《城镇排水用塑料...
英文:Technical requirements for plastics inspection chamber and manhole for urban drainage GB/T 41048-2021介绍: 国家标准《城镇排水用塑料...