單項選擇題

Navigators use navigational aids, such as（）（羅經(jīng)）.

A.sextant
B.binoculars
C.compass
D.loran

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單項選擇題

（）（電羅經(jīng)）can tell us true north.

A.VHF
B.Radar
C.Chart
D.Gyro-compass

單項選擇題

Officers observe ships with a pair of （）（望遠(yuǎn)鏡）.

A.sextant
B.binoculars
C.compass
D.radar