48.下列那一個訊號的頻率為60Hz?
(A)2828sin(60t)
(B)60sin(60πt)
(C)8sin(120πt)V
(D)2sin(120t)V

答案：登入後查看
統計： A(0), B(4), C(12), D(2), E(0) #2722549