gb321
gb321, Total:2 items.
The international standard classification for "gb321" includes: Metrology and measurement in general .
The Chinese standard classification for "gb321" includes: Comprehensive Technology .
General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China
- GB/T 321-1980 Preferred numbers and preferred number series
- GB/T 321-2005 Preferred numbers -Series of preferred numbers
