选项
A.
A.$F=dfrac{pi^2hbar^2n^2}{2ma^3}$
B.
B.$F=dfrac{pi^2hbar^2n^2}{ma^3}$
C.
C.$F=dfrac{2pi^2hbar^2n^2}{ma^3}$
D.
D.$F=dfrac{2pi^2hbar^2n^2}{3ma^3}$
正确答案：
名词解析
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