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Here the material is heated in a partial vacuum.
物质要在部分真空罐中加热。
youdao
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Vacuum heat treatment is the new technique in the heat treatment of metallic material.
真空热处理是金属材料热处理领域的新技术。
youdao
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Vacuum heat treatment is the new technique in the heat treatment of metallic material.
真空热处理是金属材料热处理领域的新技术。
youdao