“standard-frequency signal”的概念、定义、翻译、参考文献-科学参考

单词	standard-frequency signal
释义	standard-frequency signal [`stan·dǝrd ¦frē·kwǝn·sē ´sig·nǝl] ^{COMMUNICATIONS} One of the highly accurate signals broadcast by government radio stations and used for testing and calibrating radio equipment all over the world; in the United States signals are broadcast by the National Bureau of Standards' radio stations WWV, WWVH, WWVB, and WWVL.
随便看	compound angle compound compact compound cryosar compound curve compound die compound distribution compound elastic scattering compound engine compound event compound eye compound fault compound field winding compound generator compound gland compounding compound leaf compound lens compound lever compound magnet compound microscope compound modulation compound motor compound nucleus compound number compound pendulum

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