下列关于放射性元素的半衰期的几种说法正确的是 A.同种放射性原素在化合物中的半衰期比在单质中长b.氡的半衰期是38天有4个氡原子核 Template




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tomski下列关于放射性元素的半衰期的几种说法正确的是 a.同种放射性原素在化合物中的半衰期比在单质中长b.氡的半衰期是38天有4个氡原子核 coloring