一列机械波沿x轴负方�传播在某时刻的波形如图中实线所示经过一段时间以后波形图象变成图中虚线所示波速大小为1 M/s.那么这段时间可能是 Template




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tomski一列机械波沿x轴负方�传播在某时刻的波形如图中实线所示经过一段时间以后波形图象变成图中虚线所示波速大小为1 m/s.那么这段时间可能是 coloring