20.兩線圈的耦合係數為0.5,且其自感量各為10mH與40mH,則其互感量為?
(A)10 mH
(B)15 mH
(C)25 mH
(D)50 mH
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統計: A(100), B(13), C(12), D(3), E(0) #3325968
統計: A(100), B(13), C(12), D(3), E(0) #3325968