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An instrument for measuring the absorption of cosmic radio waves by the ionosphere.
1950s; earliest use found in Geophysics & IGY. From the initial letters of relative ionospheric opacity + -meter.
雅致网英汉双解词典包含236457条英汉翻译词条，涵盖了常用英语单词及词组短语的翻译及用法，是英语学习的必备工具。