中国航天员在轨驻留6个月，1天消耗1700升氧气，氧气怎么来的？

{"info":{"title":{"content":"中国航天员在轨驻留6个月，1天消耗1700升氧气，氧气怎么来的？","en":"Chinese astronauts stay in orbit for 6 months, consuming 1700 liters of oxygen in 1 day, how did the oxygen come from?"},"description":{"content":""}},"items":[]}