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Technology
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分区切块开采法
block system
分区开采
mining by areas
分区开采
sectional mining
分区开采
mining in areas
分区开采
block mining
分区开采法
block system
分区开采法
block mining system
分区短柱开采法
block panel system
分段区域开关
sectional switch
未充分开发地区
underdeveloped regions
未充分开发地区
underdeveloped region
未充分开发的地区
underdeveloped region
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