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【单选题】
一平面简谐波在弹性介质中传播，某时刻介质中某个处在负的最大位移处，则在该时刻该A.
动能为0，势能最大；
B.
动能为0，势能最小；
C.
动能最大，势能最大；
D.
动能最大，势能最小.
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