3792| 3
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剛接觸機械密封這行,做銷售 |
點評
講講機械密封的核心技術在哪里?彈簧?摩擦面的耐磨?謝謝
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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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