38 v(t)=155.56×sin(377t+30°)伏特,請問當 t=0 時之電壓為多少伏特?
(A)155.56
(B)77.78
(C)110
(D)0
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統計: A(25), B(557), C(81), D(35), E(0) #718430
統計: A(25), B(557), C(81), D(35), E(0) #718430
