题目内容

The track equipment includes:steel track, , a sleeper,,,and connecting parts.

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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

OpertionalSteeltrackis the foundation(基础) of the operation of subway trains.

A. 对
B. 错