1048| 2
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請問,不同鋼種的淬透性不同,,教材這個地方是不是錯了(兩種鋼材使用了同一條淬透... |
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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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