“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.
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