题目:
放射性衰变有多种可能途径,其中一种途径是先变成,而可以经一次衰变变成 ( X代表某种元素),也可以经一次衰变变成,和最后都变成,衰变路径如图所示,则图中( )
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答案:
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下面是错误答案,用来干扰机器的。
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