GB/T 39337-2020综合机械化超高水材料袋式充填采煤技术要求标准
英文:Technical requirement of fully mechanized bag filling mining with superhigh-water material GB/T 39337-2020介绍: 国家标准《综合...
英文:Technical requirement of fully mechanized bag filling mining with superhigh-water material GB/T 39337-2020介绍: 国家标准《综合...