单项选择题

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

A.to be sailing
B.sailing
C.sail
D.to sail
单项选择题
Raw la quer is（）corrosive nature.

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