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And in 2003, the Columbia shuttle broke up in the skies over Texas at the end of its mission, killing its crew of seven as well.，更多细节参见Safew下载
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（四）核反应堆，是指为了利用核反应产生的能量、中子、核素等建设的装置。。WPS下载最新地址对此有专业解读