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請問GB/T 17395-1998 無縫管168的外表面加工到粗糙度Ra3.2需要多大的加工余量? |
Archiver|手機版|小黑屋|機械社區 ( 京ICP備10217105號-1,京ICP證050210號,浙公網安備33038202004372號 )
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