At a news briefing on Friday, NASA administrator Jared Isaacman described a vast overhaul to the moon-to-Mars program. The changes scrap the Artemis III lunar landing and instead make it a flight in low-Earth orbit for a crew to practice meeting up with either the SpaceX or Blue Origin-built lunar landers — or, perhaps, both.
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（一）按照纳税人最近时期销售同类货物、服务、无形资产或者不动产的平均价格确定；
- 子节点i的父节点: (i-1)/2