The project is of great significance for aircraft manufactures and airlines to evaluate direct operating cost (DOC) and control aircraft design.
该科研项目对飞机制造商，航空公司在飞机设计宣传，控制成本方面有着极其重要的意义。
The project is of great significance for aircraft manufactures and airlines to evaluate direct operating cost (DOC) and control aircraft design.
该科研项目对飞机制造商，航空公司在飞机设计宣传，控制成本方面有着极其重要的意义。
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