The drilling mining method is a new Coal-mining method.
钻机采煤法是一种新型的采煤方法。
Sub-level caving is an efficient and safe mining method.
无底柱分段崩落采矿法是一种高效安全的采矿法。
Coal mining method and technics are core of high production and efficient mine's building.
采煤方法及工艺是高产高效矿井建设的核心。
Coal mining method and technics are core of high production and efficient mine's building.
采煤方法及工艺是高产高效矿井建设的核心。
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