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Actinium Series (U -235）

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salinna8868
 
Reply Wed 24 Feb, 2010 08:41 pm
ｈｏ??-　ｄｏ　??-ｅ　ｃａｌｃｕｌａ??"ｅ　??"ｈｅ　Actinium Series (U -235）??-ｈａ??"??"　??"ｈｅ　ｆｏ??'ｍｕｌａ？　ｍａｎｙ　ｄｅｃａｙ　ｉ??"　??"ｈｅ??'ｅ？　??-ｈａ??"　ｉ??"　ｌｏｎｇｅ??"??"　ａｎｄ　??"ｈｏ??'??"ｅ??"??"　ｈａｌｆ　ｌｉｆｅ？
ｍａｎ　ｉ　ｍ　??"??"ｕｃｋ，　ｐｌｅａ??"ｅ　ｈｅｌｐ
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