15147| 20
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求教玻璃和什么材料之間的摩擦系數最大? |
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點評
NO.it is true!
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點評
兩個玻璃彈珠
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點評
求證后可得最佳論文獎。
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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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