A.供電線的電阻B.接觸網(wǎng)的電阻C.鋼軌的電阻D.變壓器的電阻
A.牽引網(wǎng)阻抗增大B.電壓損失過大C.供電臂末端電壓低D.牽引電流減小
A.75.3%B.84%C.94.5%D.100%