[国外标准] ASTM A722/A722M-1998(2003)
[国外标准] ASTM A722/A722M-07 Standard Specification for Uncoated High-Strength Steel Bars for Prestressing Con
[国外标准] ASTM A722/A722M-05 Standard Specification for Uncoated High-Strength Steel Bar for Prestressing Conc