"是桂海潮航天员！"9月11日，北京航空航天大学校内，正在北京航空航天博物馆研学的山东青岛 五十八中学生刘冠良发现一个熟悉的身影。 1955年，钱学森冲破重重阻挠，毅然回到祖国怀抱，为中国航天事业作出了不可磨灭的历史性贡 献。最近，上海交大钱学森图书馆举办"破壁者的越洋归航"新生参观活动。一件件展品，诉说着当年的 故事："克利夫兰总统号"邮轮上的票据见证归国不易，钱学森、蒋英夫妇携带回国的牛皮箱满载报国热 情……参观展览后，何子杰说："我更加坚定了学习的方向：将来用所学回报国家。" 许多高校展馆再现了科学家工作的场景，同学们聆听他们的故事，希望弘扬老一辈科学家以身许 国、心系人民的光荣传统。 湖南农业大学袁隆平科学家精神展示馆里，一句句话语引人注目："学农爱农，青春无悔""成功没 有捷径。我不在家，就在试验田；不在试验田，就在去试验田的路上"……袁隆平说过、题写过的句 子，激励着师生"做一粒好种子"。 "一次，我在进行水稻实验时操作失误，导致数据偏差。"湖南农业大学农学院学生李奕回忆，沮丧 之余，她想起袁隆平的话：失败了不气馁，再试一次，也许就成功了。于是，李奕重拾信心，再次进行 实验，最终取得准确结果。如今 ...

"是桂海潮航天员！"9月11日，北京航空航天大学校内，正在北京航空航天博物馆研学的山东青岛五十 八中学生刘冠良发现一个熟悉的身影。 "我想问一下在场同学，航天服分几个类别？"馆藏的舱外航天服旁，北航宇航学院教授、航天员桂海潮 正为研究生讲解，吸引了许多参观者。 "我仿佛看到航天员穿着航天服，遨游太空……"这天，刘冠良在日记中写道。 高校是科技创新体系的重要组成部分，许多高校的博物馆、纪念馆等有浓浓的科技味。在这里，同学们 畅游科学海洋，接受精神洗礼，立下科学志向。 听科学家故事 "我愿竭尽全力，和中国人民一道建设自己的国家，使我的同胞能过上有尊严的幸福生活。"上海交通大 学钱学森图书馆红色外墙上，镌刻着钱学森的话语。静静驻足品读，上海交大2025级本科生何子杰十分 感动。 "高中时，我就听过钱学森图书馆馆长的报告。今年，我考入上海交大，成为钱老的校友。"何子杰说， 钱学森的故事一直鼓舞着自己。 1955年，钱学森冲破重重阻挠，毅然回到祖国怀抱，为中国航天事业作出了不可磨灭的历史性贡献。最 近，上海交大钱学森图书馆举办"破壁者的越洋归航"新生参观活动。一件件展品，诉说着当年的故 事："克利夫兰总统号"邮轮上的票 ...

Core Points - The exhibition "Endless Exploration: China's Aerospace, Aviation, and Navigation" opened in Hong Kong, marking the first time the National Space Administration has held an exhibition abroad covering these three fields [1][3] - The exhibition features several first-time displays in Hong Kong, including lunar samples from the Chang'e 5 and Chang'e 6 missions, models of advanced aircraft like the J-20 and Y-20, and significant maritime vessels [3][4] - The event aims to showcase China's technological innovation and provide a patriotic education opportunity for Hong Kong citizens, highlighting the region's contributions to national development [3][4] Industry Insights - The exhibition includes interactive experience projects such as "Moon Base," "My Mars Life," and "Carrier Style," aimed at engaging the public in scientific exploration [6] - Notable models on display include the Long March 5 rocket and the "Fighter" manned submersible, emphasizing advancements in aerospace and marine technology [6] - A series of science lectures and workshops will be conducted by experts, promoting public understanding of the scientific principles behind flight and deep-sea exploration [6]

Core Viewpoint - The article discusses the function and evolution of the "排焰口" (exhaust ports) on rockets, highlighting their importance in the separation process of multi-stage rockets and the advancements in rocket technology over time [1][3][4]. Group 1: Function of Exhaust Ports - The primary function of the exhaust ports is to release high-temperature and high-pressure gases generated during the ignition of rocket engines during stage separation [1][3]. - Exhaust ports are designed to manage the gas flow and prevent damage to the lower stage of the rocket during the separation process [3]. Group 2: Evolution of Design - Historically, the design of exhaust ports has evolved, initially using rod structures to allow smooth gas discharge, as seen in earlier models like the Long March 2 and Long March 3 series [3]. - With advancements in rocket technology, newer designs have shifted towards smaller or even absent exhaust ports, as demonstrated by the Long March 2F, which adopted a grid hole design, and the Long March 5, 7, and 8, which utilize cold separation methods [3].