13230资源列表

[国外标准] BS EN 13230-5-2009 Railway applications — Track — Concrete sleepers and bearers Part 5 Special eleme

[国外标准] BS EN 13230-4-2009 Railway applications — Track — Concrete sleepers and bearers Part 4 Prestressed b

[国外标准] BS EN 13230-3-2009 Railway applications — Track — Concrete sleepers and bearers Part 3 Twin-block re

[国外标准] BS EN 13230-2-2009 Railway applications — Track — Concrete sleepers and bearers Part 2 Prestressed m

[国外标准] BS EN 13230-1-2009 Railway applications — Track — Concrete sleepers and bearers Part 1 General requi