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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.，这一点在WPS下载最新地址中也有详细论述
«Политически и иначе». МИД Ирана рассказал о помощи России и Китая на фоне ударов Запада02:24。电影是该领域的重要参考
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