27.如圖(十七)所示,下列敘述何者正確?
(A) 當 c 點接地時,
= 4 V
(B) 當 c 點接地時,
= − 4 V
(C) 當 b 點接地時,
= 4 V
(D) 當 d 點接地時,
= − 4 V
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統計: A(10), B(30), C(30), D(76), E(0) #2697268
統計: A(10), B(30), C(30), D(76), E(0) #2697268