2622| 3
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20Cr與16MnCr5 |
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點評
應當反過來小直徑的滲碳大直徑的高頻
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小黑屋|手機版|Archiver|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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