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Database: 189759 (19 Oct 2025)
GB 55009-2021
Chinese Standard: 'GB 55009-2021'
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GB 55009-2021
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1379
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Days<=8
Code for design of city gas engineering
GB 55009-2021
Valid
GB 55009-2021
SIMILAR
unprotected-true-PDFs:
GB 44016-2024
GB/T 41319-2022
GB 27790-2020
GB 25035-2010