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【单选题】
一平面机械波在弹性介质中传播 , 下列叙述中正确的是( )A.
介质在其平衡位置处弹性势能最大 .
B.
介质的振动动能增大时，其弹性势能减小，总机械能守恒 .
C.
介质的振动动能和弹性势能都作周期性变化，但两者相位不相同 .
D.
介质的振动动能和弹性势能的相位在任一时刻都相同，但两者数值不同 .
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