9434| 25
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高頻淬火時(shí)某些部位不想被淬火燒到,如何屏蔽 |
評(píng)分
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點(diǎn)評(píng)
除了金屬,,書上看過(guò)有用其他材料的效果跟好,耐高溫,,陶瓷~
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點(diǎn)評(píng)
噴上去了不是還要去除?
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