The wear volume loss of positive brush is more than that of negative brush.

复合材料的电磨损体积与电刷的极性有关，正刷的磨损体积大于负刷的磨损体积；

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The negative carbon brush damage often occurs in operation.

运行中负极电刷易受损伤。

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The negative carbon brush damage often occurs in operation.

运行中负极电刷易受损伤。

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