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目前许多矿山使用国产WK-4型挖掘机,使用中回转发电机不同程度的出现过换向片和碳刷被烧,升高片并路等故障。但我矿两年两
At present, many mines use domestic WK-4 excavators, the use of rotary generators in varying degrees, there have been pieces and brushes to be burned, raising the chip and the road and other failures. But mine two years