单项选择题
（）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
点击查看答案&解析
相关考题
-
单项选择题
（）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 -
单项选择题
（）is the navigational timekeeper of the vessel.
A.The marine sextant
B.The chronometer
C.The magnetic compass
D.The gyrocompass -
单项选择题
（）is used for measuring horizontal and vertical angles.
A.The marine sextant
B.Thechronometer
C.The magnetic compass
D.The gyrocompass
