许多从事于战术导弹未来推进系统的专家们说,冲压发动机推进系统在联合技术中心将出现一个光明的前途。这是根据该公司冲压发动机计划负责人弗雷依的意见而说的。目前,联合技术中心从事于两个主要的冲压发动机合同工作,一个是液体系统,另一个 Many experts involved in the future of tactical missile propulsion systems say the ramjet propulsion system will have a bright future at the Joint Technology Center. This is based on the opinion of Frey, head of the company’s ramjet program. Currently, the United Technologies Center is engaged in contract work on two major ramjet engines, one for liquid systems and the other for