
Railway applications - Track - Concrete sleepers and bearers Part 4: Prestressed bearers for switches and crossings
出版:German Institute for Standardisation (Deutsches Institut für Normung)

專家解讀視頻
Railway applications - Track - Concrete sleepers and bearers Part 4: Prestressed bearers for switches and crossings
出版:German Institute for Standardisation (Deutsches Institut für Normung)
專家解讀視頻