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.
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，这一点在Line官方版本下载中也有详细论述
handle the 4700 Finance Communication System as a complete rework of the 3600.
2024年12月24日 星期二 新京报