History of Bridges(9.筑桥历史)

TheearliestbridgeswereprobablylogsthrownacrossstreamsorthestoneslabclapperbridgessuchasthosestillsurvivinginDevon,England.Anothertypeofwatercrossingwasprovidedbybridgesformedbyboatsfixedtogether.TheGreekhistorianHerodotus(485—425BC)providedtheearliestdocumentaryevidenceofamorepermanentstructure.Thi ......(共5980字)[阅读本文]>>

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