18. 如圖【4】所示電路,若V1 = 4V,I = 7A,則電阻R為多少歐姆?
(A)4Ω
(B)5Ω
(C)8Ω
(D)10Ω
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統計: A(210), B(12), C(15), D(15), E(0) #3424428
統計: A(210), B(12), C(15), D(15), E(0) #3424428