問題詳情
2. 下圖所示之電路，若負載為電阻性，則在開關 S1 閉合(ON)之瞬間，其接點上之火花現象為何？
(A)無火花
(B)反應對 C1 之充電電流的火花
(C)反應負載電流之火花
(D)火花時有時無。 
參考答案
無參考答案
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