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大家推薦一種在水中摩擦系數(shù)大的材料,主要是和黃銅作用,謝謝 |
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小黑屋|手機版|Archiver|機械社區(qū) ( 京ICP備10217105號-1,,京ICP證050210號,浙公網(wǎng)安備33038202004372號 )
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