求翻译：6. 毕业论文题目《民用大飞机起落架维修性设计关键技术研究》，主要研究民机起落架维修性设计的关键技术，如维修性设计要求；飞机结构的维修性问题；起落架维修性分析和验证；维修人员工效学。是什么意思？

6 thesis entitled "large civilian aircraft landing gear repair of key technology research," Research design of civil aircraft landing gear maintenance of key technologies, such as maintenance of the design requirements; aircraft structural maintenance issues; Landing Gear Analysis and validation; ma

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6. The graduation thesis topic "Civil Big Alighting carriage Maintainability Designs Key technologies Research", mainly studies the key technologies which airplane landing gear Maintainability designs, like Maintainability designs the request; Airplane structure Maintainability question; Landing gea

6. the thesis topic of the key technology research of maintainability design of civilian aircraft landing gear, main study on key technologies of maintainability design of airplane landing gear, maintainability design requirements of aircraft structural maintenance problems; analysis and verificatio

6. the thesis topic of the key technology research of maintainability design of civilian aircraft landing gear, main study on key technologies of maintainability design of airplane landing gear, maintainability design requirements of aircraft structural maintenance problems; analysis and verificatio