题目内容
运行值班人员应认真执行调度员的操作命令。
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电气运行定义?
The track equipment includes:steel track, ____________, a sleeper,____________,____________,and connecting parts.
For the power supply system, ____________ has been adopted as the mode of providing direct current for the contact rail（the third rail).
The ________ and the ________ are the foundation （基础）ofthe steel track.
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