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catalog of extragalactic radio sources
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catalog of extragalactic radio sources
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河外射电源表
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catalog of extragalactic radio sources
河外射电源表
通常指结构简单、流量密度恒定、经长期观测已准确确定了坐标的、用于天体测量和空间大地测量,或用于天文物理相位参考观测的河外射电源表列。
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Saida
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Saihantala wetland grassland
Saihanwula national nature reserve
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