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同體,,不同硬度,,如何實(shí)現(xiàn)? |
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點(diǎn)評(píng)
層主的意思是,,先把彈性?shī)A頭整體淬火成根部的硬度,然后再對(duì)工作部分高頻淬火達(dá)到更高硬度,?
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點(diǎn)評(píng)
樓上有幾位和大俠一個(gè)意思,,哈
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