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請問為何要介紹磁性?磁性和鑄造、壓力加工、焊接、切削等工藝沒有任何關系吧? |
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點評
國家圖書館在線檢索關鍵詞:磁性 & 金屬材料
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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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