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【多选题】
(多选)一振动周期为T、振幅为A,位于x=0点的波源从平衡位置沿y轴正向开始做振动.该波源产生的一列横波沿x轴正向传播,波速为v,传播过程中无能量损失.一段时间后,该振动传播至某质点P,关于质点P振动的说法正确的是( )
A.
振幅一定为A
B.
周期一定为T
C.
速度的最大值一定为v
D.
开始振动的方向沿y轴向上或取决于它离波源的距离
E.
若质点P与波源的距离x＝vT，则质点P的位移与波源的相同
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