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（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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They were referring to an earlier round of Pakistani airstrikes carried out less than a week ago - on the night of 21 February - targeting the eastern Nangarhar and Paktika provinces. The United Nations has said it has credible reports that 13 Afghan civilians were killed in those strikes.，详情可参考快连下载安装
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