調光檯燈時亮時熄，在開關處或燈頭內發出聲響，其故障原因為(A)線路短路(B)接線鬆動(C)線路斷路(D)電路過載。

問題詳情

79. 調光檯燈時亮時熄，在開關處或燈頭內發出聲響，其故障原因為
(A)線路短路
(B)接線鬆動
(C)線路斷路
(D)電路過載。

參考答案

無參考答案

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