單項(xiàng)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


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1.單項(xiàng)選擇題Radar makes it possible for us()in dense fog.

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

2.單項(xiàng)選擇題Raw la quer is()corrosive nature.

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

3.單項(xiàng)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

4.單項(xiàng)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

5.單項(xiàng)選擇題Ship is()position.

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