单选题Radar is used to not only to look（）,but also to measure their distances away from you.Aat obscured objectsBforward submerged targetsCup exposed targetsDfor unseen objects
单选题
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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