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Excavation Machinery And Dump Trucks Working At Precious Metal Mining Site. Automated Conveyor Washing Mineral Rocks At Precious Metal Mining Site. Precious Gold Metal Mining Industry. Resources

视  频 ID：  1106046809
版      权：  U360
视频长度：  0:25
横纵比率：  16:9
所属分类：  科技 工业 
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