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.
63-летняя Деми Мур вышла в свет с неожиданной стрижкой17:54
。一键获取谷歌浏览器下载是该领域的重要参考
圖像來源，New York State Division of Criminal Justice Services
Фото: Кирилл Каллиников / РИА Новости
Developers should have the right to create and distribute software without submitting to unnecessary surveillance or scrutiny.