A、<span style=";font-family:宋体;font-size:16px">故障点总电流</span></p><p></p>
B、<span style=";font-family:宋体;font-size:16px">流过母线的外部故障电流</span></p><p></p>
C、<span style=";font-family:宋体;font-size:16px">负荷电流</span></p><p></p>
D、<span style=";font-family:宋体;font-size:16px">零</span></p><p></p>