由换路定则,得 i1(0)=i1(0)=1A i12(0)=i12(0)=2A lC(0+)=Cc(0)=-1V 作0图(0 ) (0 ) 1V (0 ) (0 ) 2A (0 ) (0 ) 1A L2 L2 L1 L1 = = − = = = = + − + − + − uC uC i i i i 作0 +图 由换路定则，得