载人航天是指由人驾驶或乘坐航天器在太空工作和生活的航天活动。载人航天技术是航天技术的一个重要组成部分。由于地球外层空间具有高真空、微重力、强辐射等地面环境所不具备的特殊条件,所以,发展载人航天技术,开展载人航天活动,对国家的政治、经济、科技、军事等方面均有十? Manned spacecraft refers to space activities where people work and live in space by man or by spacecraft. Manned space technology is an important part of aerospace technology. Because of the special conditions that the Earth’s outer space does not have in high-vacuum, microgravity, strong radiation and other surface environments, the development of manned space technology and manned space activities, the country’s political, economic, scientific and technological, military and other aspects Are ten?