R44+R53-l1 R 3 +R1=0(1) R4 B R66 Ri-ri tu C 2 RSis=0 (2)IR R R33+R66 +R4i4=0(3) 回路 ABCDA D Ri-ri-ri tuu tri=o (1)+(2)8 (1) (2) 0 4 4 6 6 2 2 2 1 1 1 + − R i − R i − R i + us −us + R i = 回路ABCDA R1 + us1 - B R2 + us2 - A C R5 R4 R6 R3 D i1 i4 i6 i3 i5 i 0 (3) 2 4 4 3 3 6 6 + = + R i R i R i 0 (1) 1 1 4 4 5 5 1 + = − + − R i R i R i us 0 (2) 5 5 6 6 2 2 2 − = − − + R i R i R i us