（）sends a radio signal from the bottom of the ship to the sea-bed,from which it is reflected.<br>A:The marine sextant<br>B:The chronometer<br>C:The echo sounder<br>D:The radar

（）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

出自：海船船员证

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