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.
单项选择题 No assumptions（）on the basis of scanty information，especially scanty radar information.
单项选择题 My radar is not working.I require shore based radar assistance.Is shore based radar assistance（）?
