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單項(xiàng)選擇題

（）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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單項(xiàng)選擇題

（）is the navigational timekeeper of the vessel.

A.The marine sextant
B.The chronometer
C.The magnetic compass
D.The gyrocompass

單項(xiàng)選擇題

（）is used for measuring horizontal and vertical angles.

A.The marine sextant
B.Thechronometer
C.The magnetic compass
D.The gyrocompass