To view this page ensure that Adobe Flash Player version 10.2.0 or greater is installed.
Either scripts and active content are not permitted to run or Adobe Flash Player version 10.2.0 or greater is not installed.
姓名: 单位: 联系方式:
地球为人类提供了生存条件和各种各样的原材料满足人类的需求,但是,出了地球之外,其他星球是否也能为人类提供原材料呢?科学家们一直致力于这方面的研究,希望能减轻地球的负担。