2865| 2
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近期在設計一種閥門,選不到一個理想碟簧---求助 |
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選德國制造或者自己做
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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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