平均亮度
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average brightness temperature 亮温均值
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This paper presents an idea for the average brightness temperature of antenna aperture and its expression for a lossless antenna with matched and unmatched noise sources.
本文提出了天线口面平均亮度的概念，给出了天线终端接有匹配噪声源和非匹配噪声源时天线口面平均亮温度的表达式。
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Because RR Lyrae stars have the same average brightness, astronomers use them as standard candle distance indicators.
FORBES: Astronomers Confirm Milky Way's Most Distant Stellar Stream
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