NASA leaders said the shakeup is meant to address a larger underlying problem: the U.S. agency is flying its most powerful rocket too infrequently and repeating some of the same technical issues from one mission to the next.
Liz Kendall to launch consultation next week that will also explore alternatives such as curbs on infinite scrolling
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Фото: Clodagh Kilcoyne / Reuters
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（六）放射性同位素，是指化学元素中具有相同原子序数，但质量不同且能发生放射性衰变的核素。