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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相关考题
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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 -
单项选择题
No assumptions（）on the basis of scanty information，especially scanty radar information.
A.should not be made
B.are not to be taken
C.should be taken
D.shall be made
