（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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It was one of the greatest understatements of all time. The crew were in big trouble - a dramatic explosion had disabled their craft.
Задержан топ-менеджер из структуры «Росатома». Его обвиняют в финансировании ВСУ16 января 2026
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