A Research in Drift Layout of Mechanized Coal Face Panels in Gentle Dip,selfcombustible Thick Seams by Slice Mining是什么意思_A Research in Drift Layout of Mechanized Coal Face Panels in Gentle Dip,selfcombustible Thick Seams by Slice Mining在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句