2933| 9
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有關(guān)機械設(shè)計圖紙技術(shù)要求事宜 |
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點評
調(diào)質(zhì),?淬火低回能到50都不錯了。誤人子弟,。
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點評
我們要用硬度計檢測。
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小黑屋|手機版|Archiver|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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