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圖中垂直升降的機構是什么機構? |
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點評
是齒輪齒條還是滑動絲?齒輪齒條不自鎖!!
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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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