[农业行业标准] NY/T 4447-2023 肉类气调包装技术规范
[甘肃地方标准] DB62/T 4447-2021 糖用甜菜品种 SR-411
[国外标准] BS 4447-1973 Specification for the performance of prestressing anchorages for post-tensioned constru
[冶金行业标准] YB/T 4447-2014 干熄焦炉用耐火制品
[轻工行业标准] QB/T 4447-2013 漆艺家具
[船舶行业标准] CB/T 4447-2017 铜通舱管件