（八）放射源，是指除研究堆和动力堆核燃料循环范畴的材料以外，永久密封在容器中或者有严密包层的放射性材料。
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"It is awesome to have crew 9 home, just a beautiful landing," said Joel Montalbano, deputy associate administrator, Nasa's Space Operations Mission Directorate.
2026-02-27 00:00:00:0本报记者 李 纵 陈阳代表——
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Фото: Stringer / Reuters