2697| 10
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齒輪加工求助 |
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點(diǎn)評(píng)
嗯,謝謝
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點(diǎn)評(píng)
關(guān)鍵這個(gè)設(shè)備。。。
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點(diǎn)評(píng)
20CrMnTiH,熱處理要求滲碳,樣品量少
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