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

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.

ENGADGET: blogger-avatar

They also failed to note that the F-35 management system was designed to track all costs associated with operations and support, whereas legacy aircraft lacked comprehensive accounting systems.

FORBES: Massive Cost Estimate For Fighter Program Is Misleading