4089| 16
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這表面裂紋是什么原因產生的? |
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點評
難道是材料的問題?還是加工刀痕?
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點評
乙方:得加錢
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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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