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[GB-国家标准] GB985-88气焊、手工电弧焊及气体保护焊焊缝坡口的基本形式与尺寸 |
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帮助文档|清除痕迹|广告位|Archiver|手机版|小黑屋|空分之家 ( 鲁ICP备10016836 )
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