............................................................................. 25 4.11 牵引中心目视检查................................................................................................. 26 4.12 制动单元目视检查................................................................................................. 26 4.13 接地回路单元电刷磨损检查................................................................................. 27 4.14 轮缘润滑器............................................................................................................. 28 5结语................................................................................................................................... 29 参考文献......................................................................................................................... 30
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