12.如图所示曲线表示一列横波的波形其中实线是t1=1 S时的波形虚线是t2=25 S时的波形且t2 T1小于一个�期由此可以 Template




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tomski12.如图所示曲线表示一列横波的波形其中实线是t1=1 s时的波形虚线是t2=25 s时的波形且t2 coloring