3. 示波器波形如下圖,Time/Div=2m,請問f=?
(A)200Hz
(B)100Hz
(C)60Hz
(D)20Hz
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統計: A(1), B(1), C(3), D(0), E(0) #3681596
統計: A(1), B(1), C(3), D(0), E(0) #3681596