2894| 4
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請問在砂型鑄造中懸臂型芯長徑比有限制嗎? |
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點評
嗯是這么個問題
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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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