| 摘 要： | In the mid of the 1970s,China began to develop its first oxygen/hydrogen rocket engine,which is designated as YF-73 and used for the third stage of the Long March 3 launch vehicle (LM-3).After successful flight tests of the LM-3,the development of a new engine-YF-75 engine started,which is for the third stage of the LM-3A.This paper describes these two engines and the development of China's cryogenic technology.It also discusses some tentative ideas about the future development of oxygen/hydrogen engine.
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