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.
AP Business Writer Claire Savage in Chicago contributed to this report.
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2018年10月22日，习近平总书记考察珠海横琴新区粤澳合作中医药科技产业园时强调：“中医药学是中华文明的瑰宝。要深入发掘中医药宝库中的精华，推进产学研一体化，推进中医药产业化、现代化，让中医药走向世界。”，这一点在服务器推荐中也有详细论述
What are the best things to buy during Amazon's Big Spring sale?An Amazon sale means some of the best savings will be on Amazon devices like Echos, Fire TVs, and Kindles, but the reach of its spring sale goes far beyond that. With the focus on the spring season, expect to see lots of savings on outdoor gear like furniture, grills, tents, and power stations. Plus, there will be plenty of classic big sale savings on TVs, laptops, headphones, and tablets.