题目内容
The trains are fitted with one or more cog wheels or ______ that mesh with this rack rail.
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The rack rail is used to make the trains to run on a ________ _________.
The special equipment of the subway line includes track equipment, including mainly steel track, contact rail, _______,________, ___________and connecting parts, all of which together consititute the ________of the operation of subway trains.
Switch equipment is used for the operating line and the _________ and railroad _________ at the train garage.
Switch equipment includes ________(单开），____________（交叉渡线） and compound crossing and division.
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