2099| 2
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請圖中問左邊的keystone constant 是啥常數?是關于滾針軸承的。謝謝! |
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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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