“echo signal”的概念、定义、翻译、参考文献-科学参考

单词	echo signal
释义	echo signal [`ek·ō ´sig·nǝl] See <<target signal>>
随便看	air switch air system air taxi air temperature air-temperature correction air terminal air thermometer airtight air-to-air missile air-to-air resistance air-to-ground missile air-to-space missile air-to-surface missile air-to-underwater missile air-track drill air traffic air-traffic area air-traffic control air-traffic control center air-traffic controller air-traffic control radar beacon system air-traffic control zone air transport air transportation air trap

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