GB/T 37768-2019中厚煤层综采工作面总体配套技术条件国家标准
英文:General matching specification for fully-mechanized mining face in medium-thickness coal seam GB/T 37768-2019介绍: 国家标准...
英文:General matching specification for fully-mechanized mining face in medium-thickness coal seam GB/T 37768-2019介绍: 国家标准...