• When a suBstance has no net electrical charge, the total numBers of positive and negative charges within it must just Be equal.

    物质没有电荷时,内部负电荷总数必定正好相等

    youdao

  • When a suBstance has no net electrical charge, the total numBers of positive and negative charges within it must just Be equal.

    物质没有电荷时,内部负电荷总数必定正好相等

    youdao

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