题目内容

当一平面简谐机械波在弹性媒质中传播时，下述各结论哪个是正确的？

A. 媒质质元的振动动能增大时，其弹性势能减小，总机械能守恒。
B. 媒质质元的振动动能和弹性势能都作周期性变化，但二者的位相不相同。
C. 媒质质元的振动动能和弹性势能的位相在任一时刻都相同，但二者的数值不相等。
D. 媒质质元在其平衡位置处弹性势能最大。

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