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Standards GB - Chinese national standards - Page 7825
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 4633-1984
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WITHDRAWN published on 1.1.1984
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GB/T 4633-1997
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Determination of fluorine in coal
WITHDRAWN published on 17.4.1997
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GB 4634-1984
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WITHDRAWN published on 1.1.1984
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GB/T 4634-1996
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Determination of potassium, sodium, iron, calcium, magnesium and manganese in coal ash by atomic absorption spectrometric method
WITHDRAWN published on 19.12.1996
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GB 4637-1984
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Recording and reproducing head gaps for monophonic and three magnetic sound records on 35mm motion-picture film--Positions and width dimensions
WITHDRAWN published on 1.1.1984
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GB 4638-1984
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WITHDRAWN published on 1.1.1984
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GB/T 464.1-1989
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Paper and board--Accelerated ageing-dry heat treatment at 105
WITHDRAWN published on 31.3.1989
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GB/T 464.2-1993
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Paper and board—Accelerated ageing-Dry heat treatment at 120 or 150
WITHDRAWN published on 1.3.1993
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GB/T 4643-1984
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16mm negative photographic sound record on 16mm motion-picture film--Positions and dimensions
WITHDRAWN published on 14.8.1984
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GB/T 4643-2002
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Cinematography—16mm negative photographic sound record on motion-picture film-position and dimensions
WITHDRAWN published on 4.12.2002
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