“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	torsional pendulum torsional rigidity torsional vibration torsional wave torsion balance torsion bar torsion coefficients torsion damper torsion element torsion fault torsion-free group torsion function torsion galvanometer torsion group torsion hygrometer torsionmeter torsion module torsion pendulum torsion-string galvanometer torsion subgroup torsion submodule torso mountain torticollis tortoise Tortonian

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