3949| 6
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雙螺栓緊固的時候為什么要薄螺栓在下,厚螺栓在上? |
點評
那失效的時候呢?
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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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