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單項(xiàng)選擇題

Radar is of great help to ship in poor（）(能見度).

A.visibility
B.VHF
C.visible
D.compass

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單項(xiàng)選擇題

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

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

單項(xiàng)選擇題

（）（電羅經(jīng)）can tell us true north.

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