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用20號鋼空心管料鉆12.5的孔,,怎么改進到最快 |
點評
問題都沒描述清楚,是管料徑向鉆孔還是管料軸向鉆孔,?徑向鉆孔的話管外徑多大,?軸向鉆孔的話管內(nèi)徑多大?八成是管料擴孔成φ12.5,。
評分
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