GB/T 39963-2021立井冻结法凿井井壁应用C80~C100混凝土技术规程标准
英文:Technical specification on C80~C100 concrete shaft lining applied in vertical freezing shaft GB/T 39963-2021介绍: 国家标准《...
英文:Technical specification on C80~C100 concrete shaft lining applied in vertical freezing shaft GB/T 39963-2021介绍: 国家标准《...