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Standards GB - Chinese national standards - Page 8723
Standards GB are Chinese national standards, which are issued by China's Standardization Administration Office (SAC).
Chinese national standards are used all over China commonly labeled as GB standards. They determine the united production requirements regarding product safety and quality .
GB standards are often modified or created according to the international standards of ISO, IEC or any other international level.
Although, they are largely harmonized, GB standards may differ from international standards .
Approximately 15% of all GB standards are obligatory and they can be identified according to the prefix GB, after which the code of the standards follows:
GB – Obligatory national standards
GB/T – Optional national standards
GB/Z – National steering technical document
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GB/T 7771-1987
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Measurement of special metamerism index change in illuminant
WITHDRAWN published on 25.5.1987
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GB 7772-1987
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Method of measurement for noise emitted by positive-displacement vacuum pumps
WITHDRAWN published on 1.1.1987
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GB 7773-1987
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Method of measurement for mechanical vibration of positive-displacement vacuum pumps
WITHDRAWN published on 1.1.1987
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GB 7775-1987
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Vapour vacuum pumps--Measurement of the heating time and heating power
WITHDRAWN published on 1.1.1987
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GB 7776-1987
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Vapour vacuum pumps--Measurement of back-streaming rate of pump fluid
WITHDRAWN published on 1.1.1987
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GB/T 7776-1987
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Vapour vacuum pumps--Measurement of back-streaming rate of pump fluid
WITHDRAWN published on 23.5.1987
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GB/T 7777-1987
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Measurement and evaluation of mechanical vibration of reciprocating piston compressors
WITHDRAWN published on 23.5.1987
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GB/T 7777-2003
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Measurement and evaluation of mechanical vibration of displacement compressors
WITHDRAWN published on 29.10.2003
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GB/T 7778-2001
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Number designation and safety classification of refrigerants
WITHDRAWN published on 10.1.2001
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GB/T 7778-2008
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Number designation and safety classification of refrigerants
WITHDRAWN published on 12.11.2008
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