1+j20 7+140 OC 5 ×35=5 5-j20 1-j4 2-j160638j168 17 =38.81∠-14.75°(V 2+j40 0 =186-0.56(92) 5-j20 当Z,=Z0=1.86+0.5692时, 38.812 ymx4R04×1.8202.45(W)38 .81 14 .75 (V ) 17 638 168 1 4 2 160 1 4 7 140 35 5 5 20 1 20 5 j j j j j j j U OC 1.86 0.56 ( ) 5 20 2 40 0 j j j Z 当 0 1.86 0.56 时, * Z Z j L 202 .45 (W) 4 1.86 38 .81 4 2 0 2 max R U P OC