对于每个非零自然数n，抛物线与x轴交于两点，以表示这两点间的距

对于每个非零自然数n，抛物线与x轴交于两点，以表示这两点间的距离，则的值是（）

A、 B、 C、 D、

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对于每个非零自然数n，抛物线与x轴交于两点，以表示这两点间的距

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