18.如图所示实线为某时刻的波形图虚线是02s后的波形图. 1若波�左传播请在实线波形图上标出此时刻图中p点的振动方� 2若 Template




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tomski18.如图所示实线为某时刻的波形图虚线是02s后的波形图. 1若波�左传播请在实线波形图上标出此时刻图中p点的振动方� 2若 coloring