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（八）放射源，是指除研究堆和动力堆核燃料循环范畴的材料以外，永久密封在容器中或者有严密包层的放射性材料。，推荐阅读夫子获取更多信息
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A social media content creator was arrested Thursday after New York City police said he was one of a number of people who pelted officers with snow and ice during a massive snowball fight in Washington Square Park this week.
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