单项选择题
A.brightness of objects B.color of targets C.shape of targets D.bearing of objects
Most GPS receivers use the doppler shift of the carrier...
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
Magnets in the binnacles of magnetic compasses are used...
单项选择题Magnets in the binnacles of magnetic compasses are used to reduce the effect of（）.
A.deviation B.variation C.local attraction D.All of the above
It may be found that，in certain circumstances，Radar Bea...
单项选择题It may be found that，in certain circumstances，Radar Beacon can cause unwanted interference particularly（）.
A.at close range B.at end on situation C.at head on situation D.at crossing situation
