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單項選擇題

Radar makes it possible and much safer for us to sail（）.

A.in dense fog
B.in boisterous weather
C.in the open sea
D.in rivers

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單項選擇題

Radar beacons are transmitters designed to produce a（）on the screens of ship’s radar sets.

A.incorrect image
B.distinctive image
C.pictorial image
D.pictographic image

單項選擇題

Proper use shall be made（）radar equipment.

A.with
B.to
C.for
D.of