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【简答题】
在右下图所示的电路中, E 1 =40V , E 2 =5V , E 3 =25V , R 1 =5 Ω, R 2 = R 3 =10 Ω,试用支路电流法求各支路的电流。
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【简答题】With time and effort he her address.
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【多选题】对备用电源自动投入装置(APD)的要求
A.
工作电源不论何种原因消失，APD应动作
B.
APD只允许动作一次
C.
电压互感器二次回路断线时，APD不应误动作
D.
应保证在工作电源断开后，备用电源电压正常时，才投入备用电源
【简答题】With time and effort he___________________________________________________________________.
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