GB/T 37809-2019大倾角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 coal mining face in deeply inclined coal seam GB/T 37809-2019介绍: ...
英文:General matching specification for fully-mechanized coal mining face in deeply inclined coal seam GB/T 37809-2019介绍: ...