... RoSat 罗萨特（伦琴卫星） RORSAT 雷达型海洋监视卫星 RME 中继反射镜实验卫星 ...
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The Soviet RORSAT radar satellites were powered by a NaK-cooled reactor. Apart from the wide liquid temperature range, NaK has a very low vapor pressure, important in the vacuum of space.
相当大的温度范围内仍然是液态，此外，钾钠合金蒸气压非常低，这一点在真空条件下显得尤为重要。
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