单项选择题

Radar makes the most accurate determination of the（）.

A.direction of a target
B.distance to a target
C.size of a target
D.shape of a target

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单项选择题
Radar is not only to obtain（），but also to measure their distance away from you.

A.brightness of objects
B.color of targets
C.shape of targets
D.bearing of objects
单项选择题
Most GPS receivers use the doppler shift of the carrier phase to compute（）.

A.Latitude
B.Longitude
C.Speed
D.Time
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