如圖:電流I為()
A.3A B.-(3/2)A C.-1A D.2A
如圖所示Zab為()
A.2/3Ω B.5/3Ω C.2-jΩ D.1-jΩ
電路如圖,當(dāng)Va=0伏時,Vb=+3伏時(二極管正向壓降忽略不計),輸出F為()
A.12V B.-12V C.0V D.+3V