留礦回採 的英文怎麼說
中文拼音 [liúkuànghuícǎi]
留礦回採
英文
shrinkage stoping-
Study on high sublevel stoping of shallow - hole shrinkage system with sill pillar in thin - small ore body
薄小礦體有底柱淺孔留礦法高分段回採的研究The practice of bolt support technology by remaining narrow and small coal column for extraction roadway in longgu coal mine
龍固煤礦留窄小煤柱回採巷道錨桿支護技術的實踐
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