[机械行业标准] JB/T 9999-2013 55°圆锥管螺纹搓丝板 清晰版
[机械行业标准] JB/T 9999-2013 55°圆锥管螺纹搓丝板
[国外标准] BS 9999-2008 Code of practice for fire safety in the design, management and use of buildings
[国家标准] GB/T 9999-1988 中国标准刊号
[机械行业标准] JB/T 9999-1999 55°圆锥管螺纹搓丝板