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如何加工得到一個四周實心的腔 |
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點評
有些情況下鑄造也可以用。
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小黑屋|手機版|Archiver|機械社區(qū) ( 京ICP備10217105號-1,京ICP證050210號,浙公網(wǎng)安備33038202004372號 )
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