When a suBstance has no net electrical charge, the total numBers of positive and negative charges within it must just Be equal.
当物质没有净电荷时,它内部的正负电荷总数必定正好相等。
When a suBstance has no net electrical charge, the total numBers of positive and negative charges within it must just Be equal.
当物质没有净电荷时,它内部的正负电荷总数必定正好相等。
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