6297| 18
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有沒有人提出過一種無摩擦軸承的概念? |
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點評
記錯啦,是第四卷
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點評
是的,現(xiàn)在主要用在陀螺上。
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Archiver|手機版|小黑屋|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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