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用20號(hào)鋼空心管料鉆12.5的孔,怎么改進(jìn)到最快 |
點(diǎn)評(píng)
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(kuò)孔成φ12.5,。
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