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电气运行定义?

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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.

Theexpression “railroadtrack”isusedinBritishEnglish.

A. 对
B. 错