20.如图中的实线是某时刻的波形图像虚线是经过02s时的波形图像 1假定波�左传播求它传播的可能距离 2若这列波�右传播求 Template




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tomski20.如图中的实线是某时刻的波形图像虚线是经过02s时的波形图像 1假定波�左传播求它传播的可能距离 2若这列波�右传播求 coloring