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12.( )已知繼電器的電路分為:1.控制電路(連接電源、控制繼電器運作),2.工作電路(連接待控制的元件與電路)。則控制電路應該連接在圖中的哪組接點? (A)甲、丁 (B)乙、丙 (C)乙、戊 (D
問題詳情
12.( )已知繼電器的電路分為:1.控制電路(連接電源、控制繼電器運作),2.工作電路(連接待控制的元件與電路)。則控制電路應該連接在圖中的哪組接點?
(A)甲、丁
(B)乙、丙
(C)乙、戊
(D)丙、戊
參考答案
答案:A
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14.某實驗室有調控溫度的設備,使得某日溫度y(°C)對時間t(小時)可用正弦波y=Asin(Bt+C)來描述兩者的關係,其中A、B、C為常數。已知該日上午7點達到最高溫度18°C,並一路下跌至上午8
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