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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.。关于这个话题，同城约会提供了深入分析
。夫子对此有专业解读
Maggie 姐在新花都夜总会（图：南方人物周刊记者 方迎忠）。旺商聊官方下载对此有专业解读
No-one has yet taken responsibility for what happened.
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