13497| 12
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為什么完全退火后硬度降低,正火后硬度增加? |
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點(diǎn)評(píng)
對(duì)頭
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點(diǎn)評(píng)
不錯(cuò)
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點(diǎn)評(píng)
前輩,耐心足夠
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