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.
12月22日，一群野鸭和鸳鸯聚集在北海公园太液池上。图/IC photo
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（一）非正常损失的购进货物，以及与之相关的加工修理修配服务和交通运输服务；
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