如图为一列在均匀介质中沿x轴正方�传播的简谐横波在t=0时刻的波形图已知波速为4ms则 A.质点p此时振动方�沿y轴正方�b.质点p Template




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tomski如图为一列在均匀介质中沿x轴正方�传播的简谐横波在t=0时刻的波形图已知波速为4ms则 a.质点p此时振动方�沿y轴正方�b.质点p coloring