The contact voltage drop was low in the initial stage of wear, then rose to a certain level, finally became stable.

结果表明：在电磨损初期接触电压降较小，随着时间延长，接触电压降上升并趋于稳定；

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The contact voltage drop was low in the initial stage of wear, then rose to a certain level, finally became stable.

结果表明：在电磨损初期接触电压降较小，随着时间延长，接触电压降上升并趋于稳定；

youdao