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热处理是将钢在液态下采取特定的加热、保温、冷却方法，控制其相变过程，以获得工程上所需的组织、结构、性能的一种工艺过程。
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Of all the notable mountains in China, Mount Huangshan in the south of Anhui province, is probably the most famous.
All stones on the mountain will inspire the imagination.
You will be excited by the beauty when all the red leaves are floating on the white clouds in autumn.
It is said that the hot Springs can help prevent skin, joint, and nerve illness.
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