7169| 16
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請問一下材料的剩磁有什么標準么 |
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點評
硬質合金硬度高不導磁
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點評
看看比磁化系數定義
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小黑屋|手機版|Archiver|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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