單項選擇題Proper use shall be made()radar equipment.

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


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1.單項選擇題Radar is used to not only to look(),but also to measure their distances away from you.

A.at obscured objects
B.forward submerged targets
C.up exposed targets
D.for unseen objects

2.單項選擇題Radar makes it possible for us()in dense fog.

A.to be sailing
B.sailing
C.sail
D.to sail

3.單項選擇題Raw la quer is()corrosive nature.

A.in
B.of
C.on
D.with

4.單項選擇題Roll-on/roll-off ships are equipped with().

A.cargo elevators
B.conveyor belts
C.ramps
D.derricks and winches for cargo handling

5.單項選擇題Shall we()wait at the roadstead till there is a free berth for us?

A.must
B.ought to
C.have to
D.never