In modern fathometers the sonic or ultrasonic sound waves are produced electrically by means of a(n)（）.<br>A:transmitter<br>B:transducer<br>C:transceiver<br>D:amplifier

In modern fathometers the sonic or ultrasonic sound waves are produced electrically by means of a(n)（）.
A:transmitter
B:transducer
C:transceiver
D:amplifier

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