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卤素测试
Author：iPEN    Click：1034    Time：2015/5/15
化学周期表中的第 ⅦA 族元素包括氟（ F ）、氯 (Cl) 、溴（ Br ）、碘（ I ）、砹（ At ），合称卤素。其中砹（ At ）为放射性元素，在产品中几乎不存在，前四种元素在产品中特别是在聚合物材料中以有机化合物形式存在。
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