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

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