7313| 17
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絲錐攻鋼件壽命問(wèn)題 |
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點(diǎn)評(píng)
想辦法把孔割開(kāi),,打硬度啊 如果有問(wèn)題就從鉆頭上改善,。
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點(diǎn)評(píng)
硬質(zhì)合金絲錐一只幾千大洋,,斷了虧死了
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