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單項選擇題

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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單項選擇題

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

單項選擇題

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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