1.Earth-Moving Machines

EarlyEarth-MovingMachinesBuildingIronAgeforts,diggingcanals,makingrailroads,andconstructionmodernhighwayshaveallrequiredtheshiftingofhundredsoftonsofsoil.Asaresult,fromtheIronAgetothepresentmenhavedevisedvariousmachinesformovingearth.Oneoftheearliestearth ......     (本文共 5541 字 )     [阅读本文]>>




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