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更换下的冶金机械典型零件修复的经济性应进行分析。给出了一个指导公式和两个实用公式，提出将可修件分为三类依不同的修复思想进行修复，并介绍了实例。
Replacement of the metallurgical machinery under the repair of the economy should be analyzed. A guiding formula and two practical formulas are given. It is proposed that the repairable parts be divided into three categories according to different repair ideas and the examples are introduced.