11. 已知Va = 45V,Vb = − 5V,則Vab =?
(A)50V
(B)40V
(C) −50V
(D)− 40V
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統計: A(497), B(90), C(37), D(14), E(0) #3211206
統計: A(497), B(90), C(37), D(14), E(0) #3211206