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International Electrotechnical Commission standard
https://www.iec.ch/standards-development
ISO standard
https://www.iso.org/home.html
International Telecommunication Union (ITU)
https://www.itu.int/ITU-T/index.html
International Air Transport Association (IATA)
https://www.iata.org
China Bidding Network
https://www.spc.org.cn
China Standard Service Network
https://www.cssn.net.cn/cssn/index
