4485| 22
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不明就辯(16)—奇怪的接頭 |
點評
螺母就是個普通螺母,密封靠上面那個銅片密封
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點評
論立方
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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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