“ultrasonic depth finder”的概念、定义、翻译、参考文献-科学参考

单词	ultrasonic depth finder
释义	ultrasonic depth finder [¦ǝl·trǝ`sän·ik `depth ´fīn·dǝr] ^ENGINEERING A direct-reading instrument which employs frequencies above the audible range to determine the depth of water; it measures the time interval between the emission of an ultrasonic signal and the return of its echo from the bottom.
随便看	Sagitta sagitta sagittal sagittal coma sagittal focus sagittal plane sagittal surface Sagittariidae Sagittarius Sagittarius A Sagittarius arm Sagittarius B2 Sagittarius star cloud sagittate sagittocyst Sagnac effect sago sag pond Saha ionization Saha's equation sahel sahlinite sahlite Sail sail

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