单项选择题
Radar reflectors are required for（）.
A.all fishing vessels over 39 feet in length
B.sail-propelled fishing vessels
C.all fishing vessels of less than 200 GT
D.wooden hull fishing vessels with a poor radar echo
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相关考题
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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 -
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
