●当=0时,S12=+jo0,为一对共轭虚根。则 i, (t)=kcos(ot+6 i1(0+)=kcos6=0 k Lo di (o,)=-Lko, sine=v 6=90 则有 coS(@ot+90) 称无损耗情况当=0时，s1 ,2=j0，为一对共轭虚根。则 0 ( ) cos( ) L i t k t = +   由 0 0 (0 ) cos 0 (0 ) sin L L i k di L Lk V dt    + +  = =   = − =   0 0 90 V k L    = −    = 则有 称无损耗情况 0 0 ( ) cos( 90 0 L d V i t t t L   = − + ) …