echo depth-sounding
(the determination of depth of water by the measurement of the time interval required for a sonic or supersonic pulse reach the transmission point after being reflected from the bottom) प्रतिध्वनि गभीरता परिज्ञापन
(the determination of depth of water by the measurement of the time interval required for a sonic or supersonic pulse reach the transmission point after being reflected from the bottom) प्रतिध्वनि गभीरता परिज्ञापन
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