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通过宏观检查、理化、金相及理论计算等方法，对催化裂化装置四机组齿轮箱断齿原因进行了全面分析。
Through the macroscopic examination, physical and chemical, metallurgical and theoretical calculation methods, the reasons for the broken gear of the four-unit gearbox of a catalytic cracking unit were analyzed comprehensively.