5489| 12
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請教,能根據(jù)斷面分析出鉆頭是怎么折斷時的嗎? |
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點評
大俠是一個實際經(jīng)驗很豐富的人
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點評
我寫錯了,沒有反轉(zhuǎn),是想問進(jìn)刀斷的還是退刀斷的,
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點評
謝謝
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點評
謝謝
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點評
謝謝
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