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反围盘发明成功50年后,某大型露天矿上,检修班组几位成员针对国外大型进口设备维修成本昂贵的问题,探索出一套适合矿上
Fifty years after the invention of the anti-encircling disk, several members of the maintenance team on a large-scale open-pit mine explored a suitability for the mines in view of the high cost of repairs to foreign large-scale imported equipment.