WE-NASA Spacecraft, Dawn, Close to Reaching a "Dwarf Planet"-电子课件

NASA Spacecraft, Dawn, Close to Reaching a "Dwarf Planet"

新闻宇宙VOA Special 2015自然科技VOA

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美国国家航空航天局飞船将于三月登陆矮行星

页数：397页

来源：VOA 2016-06-01

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