Grave protrusion coal seam tunnelling hydraulic cutting protrusion-dispelling measures is a new technology in the world.
严重突出煤层掘进水力掏槽防突措施在国际上是一种防突新技术。
Grave protrusion coal seam tunnelling hydraulic cutting protrusion-dispelling measures is a new technology in the world.
严重突出煤层掘进水力掏槽防突措施在国际上是一种防突新技术。
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