“cone-of-silence marker”的概念、定义、翻译、参考文献-科学参考

单词	cone-of-silence marker
释义	cone-of-silence marker [¦kōn ǝv `sī·lǝns ´märk·ǝr] ^NAVIGATION A marker beacon, usually a Z (for zone) marker beacon, located at a radio-range station; operates at 75 megahertz and produces a light signal accompanied by a 3000-hertz tone.
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