7072| 26
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分析斷面斷裂原因 |
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點(diǎn)評(píng)
焊過(guò)的痕跡是怎么回事。
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點(diǎn)評(píng)
不應(yīng)該是表面吧,這種軸一般都是整體調(diào)質(zhì)處理的。
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