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381.21 KB2021-08-01
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[国外标准] BS EN 969-2009 Ductile iron pipes, fittings, accessories and their joints for gas pipelines — Requir
737.42 KB2020-11-28
[国外标准] BS EN 969-1996 Specification for ductile iron pipes, fittings, accessories and their joints for gas
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[国外标准] BS 969-2008 Specification for limits and tolerances on plain limit gauges
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