7562| 10
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大家推薦一種在水中摩擦系數大的材料,主要是和黃銅作用,謝謝 |
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點評
接觸面減小壓強就會增大。
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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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