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现行 GB/T 21470-2008
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锤上钢质自由锻件机械加工余量与公差 盘、柱、环、筒类 Machining allowances and tolerances for steel open die forgings on hammer - Disks, columns, rings and seamless cylindrical sleeves
发布日期: 2008-02-28
实施日期: 2008-08-01
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