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A controlled deorbit requires the use of several core systems, including those for communications, power, and avionics. Some of the ISS machinery was not specifically certified to perform in a depressurized environment. (NASA believes that critical systems would remain operable, based on technical analyses, and emphasizes that many of these systems are already used in vacuum.) Another thing to worry about: the ISS losing control over its orientation in space. The spacecraft could start tumbling, flipping the station’s solar arrays away from the sun, taking the primary source of power with it.。Line官方版本下载对此有专业解读
第四条 居民委员会工作坚持中国共产党的领导，坚持和发展全过程人民民主，坚持自治、法治、德治相结合。，详情可参考雷电模拟器官方版本下载
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