单项选择题

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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单项选择题
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
单项选择题
Proper use shall be made（）radar equipment.

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