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
单项选择题 Radar is not only to obtain（），but also to measure their distance away from you.
单项选择题 Most GPS receivers use the doppler shift of the carrier phase to compute（）.
单项选择题 Magnets in the binnacles of magnetic compasses are used to reduce the effect of（）.
