单项选择题

Radar makes it possible for us（）in dense fog.

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

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Raw la quer is（）corrosive nature.

A.in
B.of
C.on
D.with
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Roll-on roll-off ships are equipped with（）.

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