3709| 6
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怎么從表面看出來工件是否進(jìn)過熱處理,如淬火等 |
點(diǎn)評(píng)
我們學(xué)校的設(shè)備比較落后 師傅說如果銼刀干不動(dòng)的車刀就干不動(dòng)
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點(diǎn)評(píng)
你拿個(gè)淬過火的材料,和沒淬過的,敲了比較一下。音質(zhì)可不一樣喔。。。
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