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保安矿柱
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保安矿柱
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回采预留矿柱
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safety pillar
保安矿柱
为保护地表重要设施、地貌和主要井巷,避免其因井下开采影响而产生破坏,或分隔含水层及破碎带、矿段或矿块等目的而留设不采或暂时不采的部分矿体。
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community ecology
community education
community education services
community elderly care
community elderly service facilities
community elite
community emergency plan
community emergency preparedness
community emergency response capacity
community emergency response team
community employment
Community environmental management
community environmental roundtable meeting
community evolution
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Community Failure
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community forestry
community for the aged
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community governance on poverty alleviation centralized settlement
Community Granaries
community head
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