單項(xiàng)選擇題

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

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單項(xiàng)選擇題

Proper use shall be made（）radar equipment.

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

單項(xiàng)選擇題

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