单选题（）sends a radio signal from the bottom of the ship to the sea-bed,from which it is reflected.AThe marine sextantBThe chronometerCThe echo sounderDThe radar
单选题
（）sends a radio signal from the bottom of the ship to the sea-bed,from which it is reflected.
A
The marine sextant
B
The chronometer
C
The echo sounder
D
The radar
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