购买标准后,可去我的标准下载或阅读
ISO/IEC 21000-21:2013 EN
Information technology -- Multimedia framework (MPEG-21) -- Part 21: Media Contract Ontology
REVISED
发布日期 :
2013-07-12
实施日期 :
ISO 15638-21:2018 EN
Intelligent transport systems — Framework for cooperative telematics applications for regulated commercial freight vehicles (TARV) — Part 21: Monitoring of regulated vehicles using roadside sensors and data collected from the vehicle for enforcement and other purposes
现行
发布日期 :
2018-06-15
实施日期 :
ISO/IEC ISP 10609-21:1995 EN
Information technology — International Standardized Profiles TB, TC, TD and TE — Connection-mode Transport Service over connection-mode Network Service — Part 21: Subnetwork-type dependent requirements for Network Layer and Data Link Layer for ISDN B-channel X.25 DTE to DTE operation
废止
发布日期 :
1995-12-27
实施日期 :