BS EN 1821-1:1997
Electrically propelled road vehicles. Measurement of road operating ability
现行
发布日期 :
1997-05-15
实施日期 :
BS EN 1821-2:1999
Electrically propelled road vehicles. Measurement of road operating ability
现行
发布日期 :
1999-12-15
实施日期 :
ITU-R F.1821
Characteristics of advanced digital high frequency (HF) radiocommunication systems
现行
发布日期 :
2022-09-01
实施日期 :