单项选择题

食指伸直，指尖向左，其余四指弯曲握拳，掌心朝向自己，是字母（）的打法。

A．f
B．d
C．e
D．g

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For the energy eigenvalues and eigenfunctions of a particle in a box, which of the following statement is not true?
A、The energy eigenvalues are doubly degenerate because the box is symmetric.
B、The eigenfunctions are orthogonal.
C、Increasing box length results in lower energy levels and smaller distance between them.
D、The energy levels of a heavier particle are lower than those corresponding to a lighter particle.