近年来,许多国家对利用近地球轨道航天器进行科学考察和地球资源考察日益重视。例如 NASA 和 ESA 对此类航天任务作了中近期规划(八十至九十年代),NASA 的型号(不包括深空探测)有空间实验室、陆地卫星-D。γ-射线观测等十几项,ESA 有 X-射线观测、空间望远镜、红外空间观测、海洋遥感、气象等近(?)项。一此幅员辽阔的发展中国家如中 In recent years, many countries have paid increasing attention to using the near-Earth orbit spacecraft for scientific investigation and exploration of the earth’s resources. For example, NASA and ESA have made short-term and medium-term plans for such space missions (from the 1980s to the 1990s), NASA models (excluding deep space exploration) and Space Labs, Landsat-D. γ-ray observations and more than a dozen, ESA has X-ray observations, space telescopes, infrared space observations, ocean remote sensing, weather and other near (?) items. A vast developing country like this one