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This paper studies the technique of laser surface treatment of grey iron.
本文探讨了激光表面处理灰铁的工艺。
youdao
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The technique of expression is unlimited, but must is a flat surface work.
表现手法不限，但必须是平面作品。
youdao
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The technique of expression is unlimited, but must is a flat surface work.
表现手法不限，但必须是平面作品。
youdao