单项选择题
The basic collision avoidance display presented by CASII is designed for easy interpretation and（）of possible collision threat situations.
A.full confirmation B.precise appreciation C.immediate assessment D.timely recognition
单项选择题 Radar makes the most accurate determination of the（）.
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（）.
