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叙述了内径为５０ｍ ｍ 试验发动机的标准化在固体推进剂研究中的重要性，并将标准发动机的设计思想进行了说明，用试验数据说明所设计的标准发动机具有高的可靠性和稳定性。
The importance of standardization of test engine with internal diameter of 50 m m in the study of solid propellants is described. The design idea of standard engine is described. The test data shows that the designed standard engine has high reliability and stability.