“Book:Group 17 elements”的意思、由来-开放百科全书

开放百科全书收录14589846条英语、德语、日语等多语种百科知识，基本涵盖了大多数领域的百科知识，是一部内容自由、开放的电子版国际百科全书。

词条	Book:Group 17 elements
释义	> Halogens
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