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Chinese Standard: GB/T 12371-1990

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Chinese Standard: GB/T 12370-1990

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Chinese Standard: GB/T 1237-2000

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Chinese Standard: GB/T 12369-1990

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Chinese Standard: GB/T 12368-1990

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Chinese Standard: GB/T 12366-2009

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Chinese Standard: GB/T 12364-2007

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Chinese Standard: GB/T 12363-2005

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Chinese Standard: GB/T 12311-2012

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Chinese Standard: GB/T 12310-2012

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Chinese Standard: GB/T 1231-2006

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Chinese Standard: GB/T 12309-1990

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Chinese Standard: GB/T 12307.3-1997

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Chinese Standard: GB/T 12305.6-1997

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Chinese Standard: GB/T 12303-2009

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Chinese Standard: GB/T 12301-1999

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Chinese Standard: GB/T 12300-1990

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Chinese Standard: GB/T 1230-2006

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Chinese Standard: GB/T 1229-2006

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Chinese Standard: GB/T 12277-1990

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Chinese Standard: GB/T 12276-1990

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Chinese Standard: GB/T 12275-1990

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Chinese Standard: GB/T 12274.1-2012

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Chinese Standard: GB/T 12273.501-2012

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Chinese Standard: GB/T 12273.1-2017

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Chinese Standard: GB/T 12272-1990

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Chinese Standard: GB/T 1227-2017

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Chinese Standard: GB/T 12267-1990

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Chinese Standard: GB/T 1226-2017

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Chinese Standard: GB/T 12251-2005

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Chinese Standard: GB/T 12250-2005

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Chinese Standard: GB/T 12247-2015

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Chinese Standard: GB/T 12246-2006

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Chinese Standard: GB/T 12245-2006

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Chinese Standard: GB/T 12244-2006

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Chinese Standard: GB/T 12243-2005

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Chinese Standard: GB/T 12242-2005

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Chinese Standard: GB/T 12241-2005

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Chinese Standard: GB/T 12240-2008

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Chinese Standard: GB/T 1224-2016

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Chinese Standard: GB/T 12239-2008

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Chinese Standard: GB/T 12238-2008

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Chinese Standard: GB/T 12237-2007

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Chinese Standard: GB/T 12236-2008

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Chinese Standard: GB/T 12235-2007

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Chinese Standard: GB/T 12234-2019

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Chinese Standard: GB/T 12233-2006

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Chinese Standard: GB/T 12232-2005

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Chinese Standard: GB/T 12230-2005

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Chinese Standard: GB/T 12229-2005

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Chinese Standard: GB/T 12228-2006

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Chinese Standard: GB/T 12227-2005

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Chinese Standard: GB/T 12226-2005

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