9.History of Bridges

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




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