4520| 16
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這種情況下, 選用什么樣的刀具既經(jīng)濟(jì)又耐用呢,? |
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點(diǎn)評(píng)
高硬度鋼只要能車的動(dòng),,粗糙度不會(huì)低的,一般0.8~0.4,。
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