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_____ is a measuring instrument that sends out an acoustic pulse in water and measures distances in terms of the time for the echo of the pulse to return.
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_____ is a measuring instrument that sends out an acoustic pulse in water and measures distances in terms of the time for the echo of the pulse to return.
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_____ is a small electronic device containing a semiconductor and having at least three electrical contacts, used in a circuit as an amplifier, detector, or switch.