单选题（）is an equipment used to detect the presence of ships ,buoys,coast and many other targels and to obtain range and bearing of these targets.AThe marine sextantBThe chronometerCThe echo sounderDThe radar
单选题
（）is an equipment used to detect the presence of ships ,buoys,coast and many other targels and to obtain range and bearing of these targets.
A
The marine sextant
B
The chronometer
C
The echo sounder
D
The radar
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