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請問在2440*1220的長方形板上布直徑237的孔能布多少個呢?能超過51個嗎 |
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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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