4125| 7
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如何焊接黃銅?無(wú)很大焊屎,表面不會(huì)發(fā)黑 |
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點(diǎn)評(píng)
用氣焊就可以 用硼砂做焊劑 不知道焊具體什么東西 說(shuō)不了太詳細(xì)
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