5037| 11
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怎么區分一個軸承是滾動軸承還是滑動軸承? |
點評
認為是正解
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點評
精辟啊,呵呵
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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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