2797| 3
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一種類似球軸承,可以轉(zhuǎn)動(dòng),但轉(zhuǎn)動(dòng)后又會(huì)自己回正的簡(jiǎn)單機(jī)械裝置 |
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小黑屋|手機(jī)版|Archiver|機(jī)械社區(qū) ( 京ICP備10217105號(hào)-1,京ICP證050210號(hào),浙公網(wǎng)安備33038202004372號(hào) )
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