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JSF方案验证机的4种发动机都在普惠公司进行试验。装波音公司的X-32B短距起飞和垂直着陆（STOVL）型的具有直接升力系统的JSF119-614S在去年11月末开始地面试验。正在试验中的发动机还有装波音公司X-32A常规起落（CTOL）型的JSF119-614C；装洛克希德·马公句的X-35ACTOL型的JSF
JSF program verifier four kinds of engines are tested in Pratt & Whitney. JSF119-614S with Boeing’s X-32B Short Range Take Off and Vertical Landing (STOVL) with direct lift system began ground trials late last November. The engines under test are also JSF119-614C, a Boeing X-32A Conventional Take-Off (CTOL) model; a JSF X-35ACTOL model fitted with Lockheed Martin’s