4613| 9
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請教:螺旋槽絲錐強度差的原因是因為結構形式還是幾何尺寸? |
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點評
“等一圈都蹦沒了 就正常使用了”還能用?
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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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