简谐波A与B在某时刻的波形如右图所示,经过t = TB时间(TB为波B的周

谐波AB在某时刻的波形如右图所示,经过t = TB时间(TB为波B的周期),两波仍出现如此波形,则两波的波速之比vA : vB可能是(     

A1:1                 B2:1   

C2:3            D4:1

答案

BD

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