In June 1962, after gruelling medical tests, Nasa announced its "New Nine". These would be the men to deliver on President Kennedy's pledge to put American boots on the Moon.
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在大多数看不见的地方，能够同时具备以上三条的银发人群，实则是少数。。Line官方版本下载是该领域的重要参考
Source: Computational Materials Science, Volume 267，详情可参考WPS下载最新地址