A、$$\dot{I}_{KA}=\dot{I}_{KB}=\dot{I}_{KC}$$,$$\dot{U}_{KA}=\dot{U}_{KB}=\dot{U}_{KC}=0$$
B、$$\dot{I}_{KA}=0$$,$$\dot{U}_{KB}=\dot{U}_{KC}$$
C、$$\dot{I}_{KB}+\dot{I}_{KC}=0$$,$$\dot{U}_{KB}=\dot{U}_{KC}$$
D、$$\dot{I}_{KB}=\dot{I}_{KC}=0$$,$$\dot{U}_{KA}=0$$