Radar beacons are transmitters designed to produce a（）on the screens of ship’s radar sets.

Proper use shall be made（）radar equipment.

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

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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

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