4045| 8
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渦輪是如何磨損的? |
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點評
"一般的蝸桿用的是錫青銅",汗!哪個老師教的?
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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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