“ultrasonic”的概念、定义、翻译、参考文献-科学参考

单词	ultrasonic
释义	ultrasonic [¦ǝl·trǝ`sän·ik] ^ACOUSTICS Pertaining to signals, equipment, or phenomena involving frequencies just above the range of human hearing, hence above about 20,000 hertz. Also known as supersonic (deprecated usage).
随便看	ground meristem ground mine ground moraine ground noise ground outlet ground plane ground-plane antenna groundplasm ground plate ground plot ground point of intercept ground position ground-position indicator ground potential ground pressure ground protection ground proximity warning system ground range ground recharge ground-referenced navigation data ground-reflected wave ground resistance ground return ground-return circuit ground rod

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