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ore pillar for mining
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ore pillar for mining
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工学
回采预留矿柱
释
ore pillar for mining
回采预留矿柱
为保护地表地貌、地面建(构)筑物和主要井巷,分隔采区或矿段,以及防水等而留设不采或暂时不采的部分矿体。煤矿中也称煤柱。
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river regulation or channel improvement
river regulation planning
river regulation structure
river restoration project
river revetment right
rivers and lakes census in China
rivers and lakes health assessment
rivers and lakes survey
river sand-mining planning
Rivers and Mountains by Wang Hui
riverscape
river sediment
river sediment measurement and grain-size analysis instrument
river sediment microbes
river sediment simulation
Riverside
Riverside Church in New York City
Riverside Church in New York City
riverside historic town
riverside intake structure
Riverside Park
rivers in China
river sluice
river snails
rivers of scenic regions
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