单选题:下列关于原子和原子核的说法正确的是A.β衰变现象说明电子式原子核的组成部门B.玻尔理论的假设之一是原子能量的量子化C.放

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题目内容:
下列关于原子和原子核的说法正确的是
A.β衰变现象说明电子式原子核的组成部门
B.玻尔理论的假设之一是原子能量的量子化
C.放射性元素的半衰期随温度的升高而变短
D.比结合能越小表示原子核中的核子结合得越牢固
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