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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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
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
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