中国航天工业总公司第四研究院简介中国航天工业总公司第四研究院是以固体火箭发动机研究、设计、制造为主，兼营非金属复合材料制品、精细化工产品、电子仪器设备、动力机械、压力容器等的大型设计研究院，共有８个研究所，６个专业工厂，两个试验站，１０余个直属单位，... The Fourth Institute of China National Aerospace Industry Corporation The fourth institute of China National Aerospace Industry Corporation is mainly engaged in the research, design and manufacture of solid rocket motors. It also includes non-metal composite products, fine chemical products, electronic equipment and power machinery. Large-scale design and research institutes, such as pressure vessels, have a total of 8 research institutes, 6 professional factories, two experimental stations, more than 10 directly-owned units,...