10.Modern Bridges

Twonineteenth-centuryinventionsledtoarevolutioninbridgebuilding.ThesewerePartlandcementandmass-producedsteel.Cementisthevitalingredientofconcrete,andmassconcretecanbeusedtobuildpiers,abutments(banksupports),andarchesof“artificial”stonetoanyrequiredshape.W ......     (本文共 5574 字 )     [阅读本文]>>




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