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Standards GB - Chinese national standards - Page 5180
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 7965-2002
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Acoustics--Measurement of underwater sound trans-ducers
Standard published on 26.3.2002
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GB/T 7966-2022
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Acoustics—Ultrasonic power measurement—Radiation force balances and the requirements
Standard published on 9.3.2022
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GB/T 7967-2002
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Acoustics--High-power characteristics of underwater sound projectors and their measurements
Standard published on 26.3.2002
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GB/T 7968-2015
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Bag paper
Standard published on 31.12.2015
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GB/T 7969-2023
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Cable paper
Standard published on 28.12.2023
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GB/T 7971-2007
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Semiconducting electric cable paper
Standard published on 5.12.2007
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GB/T 7973-2003
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Paperboard and pulps--Measurement of diffuse reflectance factor(Diff/Geometry)
Standard published on 20.10.2003
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GB/T 7974-2013
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Paper, board and pulps - Measurement of diffuse blue reflectance factor - D65 brightnessDiff/Geometry,Outdoor daylight conditions
Standard published on 10.10.2013
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GB/T 7975-2005
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Paper and board-Determination of color(diffuse reflectance method)
Standard published on 26.9.2005
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GB/T 7977-2007
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Paper,board and pulps - Determination of conductivity of aqueous extracts
Standard published on 5.12.2007
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