[甘肃地方标准] DB62/T 4449-2021 糖用甜菜品种 ZT6
[国外标准] BS 4449-2009 Steel for the reinforcement of concrete — Weldable reinforcing steel — Bar,coil and dec
[国外标准] BS 4449-1997 Specification for Carbon steel bars for the reinforcement of concrete
[冶金行业标准] YB/T 4449-2014 耐火材料用烧结镁橄榄石