8447| 12
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內(nèi)螺紋熱處理后變形,,請(qǐng)教 |
點(diǎn)評(píng)
大0.2?
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點(diǎn)評(píng)
對(duì)的,,特別是滲碳前保護(hù)一下,沒(méi)滲上碳就可以后攻牙了,。
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