3679| 9
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鉚接時為何要燒紅鉚釘? |
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點評
您說的很有道理。
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Archiver|手機版|小黑屋|機械社區(qū) ( 京ICP備10217105號-1,京ICP證050210號,浙公網(wǎng)安備33038202004372號 )
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