（六）放射性同位素，是指化学元素中具有相同原子序数，但质量不同且能发生放射性衰变的核素。
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The Ultrahuman Ring Pro comes with a snazzy Pro Charging Case for up to 45 days of additional battery life. | Image: Ultrahuman。同城约会对此有专业解读
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The Trump administration said refunds of tariffs struck down by the US supreme court “will take time”, according to court documents filed by the Department of Justice.