Railroad Transportation(12.铁路运输)

Manbuiltrailroadslongbeforehebuiltsteamenginesandbeforehehadevenmasteredthebasictechnologyofengineeringwithironandothermetals.Theearliesttrainswereconstructedoftimberandwereinoperationnotlaterthanthefourteenthcentury.Theywerebuilttoovercometheseverelimitationsofotherformsoflandtransportation.Theprovi ......(共5610字)[阅读本文]>>

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