[国外标准] BS EN 13138-3-2003 Buoyant aids for swimming instruction — Part 3 Safety requirements and test metho
[国外标准] BS EN 13138-2-2004 Buoyant aids for swimming instruction — Part 2 Safety requirements and test metho
[国外标准] BS EN 13138-1-2003 Buoyant aids for swimming instruction — Part 1 Safety requirements and test metho