常見例句A Research in Drift Layout of Mechanized Coal Face Panels in Gentle Dip,selfcombustible Thick Seams by Slice Mining 緩傾斜易自燃厚煤層分層開採(cǎi)綜採(cǎi)採(cǎi)區(qū)巷道佈置的探討 返回 selfcombustible