窄礦柱 的英文怎麼說
中文拼音 [zhǎikuàngzhù]
窄礦柱
英文
rance-
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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