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Helium is used to pressurize tanks and help push fuel into the engines. Without proper helium flow, the rocket cannot safely fly. Because the upper stage is hard to reach at the launchpad, NASA rolled the stacked rocket back into the Vehicle Assembly Building, the sky-scraping hangar where it was originally put together.
，更多细节参见快连下载安装
（二）乏燃料，是指在反应堆堆芯内受过辐照并从堆芯永久卸出的核燃料。
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