办理D7至D3的调车进路，写出D7XJJ励磁电路。

KZ→D7AJ7↓→D7FKJ1↑→D7QJ1↓→D7XJJ3－4→D7KJ1↑→3DGJ1↑→1／3DBJ1↑→5／7FBJ1↓→5DGJ1↑→ⅠAGJF1↑→XKJ1↓→D3ZJ1↑→KF

略