Requesting [tid=15] 3 x BFF
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。17c 一起草官网对此有专业解读
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，纸飞机下载提供了深入分析
Фото: Khalid al-Mousily / Reuters