单项选择题
A.in dense fog B.in boisterous weather C.in the open sea D.in rivers
Radar beacons are transmitters designed to produce a（）o...
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
Proper use shall be made（）radar equipment.A.withB.toC.f...
单项选择题Proper use shall be made（）radar equipment.
A.with B.to C.for D.of
No assumptions（）on the basis of scanty information，espe...
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
