8.如图所示沿x轴正方�传播的一列横波在某时刻的波形图为一正弦曲线 其波速为200ms下列说法中正确的是 A从图示时刻开始经过0 Template




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tomski8.如图所示沿x轴正方�传播的一列横波在某时刻的波形图为一正弦曲线 其波速为200ms下列说法中正确的是 a从图示时刻开始经过0 coloring