問題詳情
13 . 從 
蛻變成 
是天然放射性蛻變系列之一，此系列總共經過
(1)幾個a衰變
蛻變成 是天然放射性蛻變系列之一，此系列總共經過(1)幾個a衰變
參考答案
答案：D
難度：簡單0.814433
統計：A(52),B(20),C(72),D(632),E(0)
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