Similar words: coal mine, coal miner, balminess, calming, embalming, almightiness, bituminous coal, hypoalbuminemia.
31. Coalface of Daizhuang Coalmine, the authors believe that the roof in lower seam will form the"block-bulk-beam"structure easy to fall after the mining of top ultra-close seam.
32. The safety of a main well headframe would be reduced significantly, due to increased loading capacity and higher vibration frequency in a coalmine.
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