The CATbird is a modified 737 designed to test, integrate, and validate the full F-35 mission systems suite in an airborne environment before the system flies in an F-35 aircraft.

该测试台是波音737改进型，旨在飞行前对机载环境下f - 35任务系统套件进行测试、集成和验证。

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In the A, B, C, D and F grading system, the first four letters are typically considered passing grades.

在 A、B、C、D 和 F 评分体系中，前四个字母通常被认为是及格。

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Earlier this year, InterSense's IS-900 system was successfully integrated into the F-35 engineering simulators to test all components and procedures related to the aircraft.

今年的早些时候，IS - 900系统已经被成功的集成到F - 35工程学模拟器中，用来测试与该飞机相关的所有部件和程序。

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Most American colleges and universities use the grading system of A,B,C,D and F.

VOA: special.2009.03.05

The A.F.L.also opposed extremists who used labor protests to change the social system.

VOA: special.2010.05.06

So he curbed or cancelled more than 30 weapons systems including the army's Future Combat System, the F-22 Stealth fighter, two missile defence systems and the Zumwalt-class destroyer.

ECONOMIST: American military spending

The men and women Elmendorf who play a vital role in the air defense of our nation and, if necessary, in the projection of dominant aerospace power overseas understandably wanted to have as the backdrop for an important presidential address their best weapon system, the F-22 Raptor.

CENTERFORSECURITYPOLICY: How to lose a war

F. system is a nice touch, we largely suspect you'll be making a decision to buy these based on your feelings for the brand.

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