單項(xiàng)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(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
2.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
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