我国出舱活动技术日益成熟，能力和水平不断提高，可以说目前已经达到了国际先进水平。比如单次最长出舱活动时长达到了9 小时，创造了世界纪录；空间站飞天舱外航天服已顺利保障自神舟十二号任务以来的19次出舱活动，单件航天服最高使用量达17次， 已超过"3年15次"的设计指标，依然性能良好、状态稳定；机械臂通过独创的双臂级连和爬行设计，实现了航天员在空间站舱体外作 业全域可达；天地协同支持体系更加完善，为出舱活动方案制定、进程控制、跨系统协同和应急处置等提供了有效的专业支持。 总的看，我国航天员出舱活动已经实现了由技术验证、简单操作向复杂作业任务的跨越，将会在空间站的长期运行中发挥更加重 要作用。 央视网消息：4月23日上午，神舟二十号载人飞行任务新闻发布会在酒泉卫星发射中心举行，神舟二十号载人飞船瞄准4月24日17 时17分发射。发布会上，中国载人航天工程新闻发言人林西强表示，截至目前，我国已顺利实施了20次航天员出舱活动，我国航天员 出舱活动已经实现了由技术验证、简单操作向复杂作业任务的跨越。 发言人介绍，截至目前，我国已顺利实施了20次航天员出舱活动。任务可以分成四类：一是验证相关技术，包括舱外航天服、气 闸舱、 ...

Core Viewpoint - The Shenzhou-20 manned mission is set to launch on April 24, 2023, at 17:17 Beijing time, with a crew of three astronauts, including Chen Dong as the commander, marking significant progress in China's manned spaceflight capabilities [1][2]. Group 1: Manned Spaceflight Progress - The Shenzhou-20 crew consists of two pilots and one flight engineer, with Chen Dong becoming the first astronaut from the second batch to fly three times, while Chen Zhongrui and Wang Jie are set for their first flights [2]. - China has successfully conducted 20 extravehicular activities (EVA), demonstrating advanced technology and capabilities in this area, reaching an international advanced level [2]. Group 2: Lunar Mission Developments - The development of China's manned lunar mission is progressing smoothly, with the Long March 10 and Dream Chaser spacecraft undergoing initial testing as planned [2]. - Major tests for the lunar mission, including the Long March 10 electrical system matching test and the Dream Chaser's first high-altitude drop test, have been completed [2]. Group 3: Extravehicular Activity Achievements - Key technologies verified during EVAs include spacesuits, airlock operations, robotic arm assistance, and ground support for extravehicular activities [3]. - Successful assembly tasks were completed outside the space station, including the installation of external pump groups and support rods, achieving the complete design functionality of the space station [3]. - The first extravehicular maintenance was conducted to repair damage to the solar wing cables caused by space debris, restoring power generation capabilities [3]. - Proactive measures for space debris protection have been implemented, enhancing the space station's ability to respond to debris threats through multiple inspections and installations of protective devices [3].