
Pren 13230-4 - Railway Applications - Track - Concrete Sleepers And Bearers - Part 4: Prestressed Bearers For Switches And Crossings
出版:British Standards Institution

專家解讀視頻
Pren 13230-4 - Railway Applications - Track - Concrete Sleepers And Bearers - Part 4: Prestressed Bearers For Switches And Crossings
出版:British Standards Institution
專家解讀視頻