單項選擇題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


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1.單項選擇題Radar is not only to obtain（），but also to measure their distance away from you.

A.brightness of objects
B.color of targets
C.shape of targets
D.bearing of objects

2.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

3.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

4.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

5.單項選擇題It is dangerous for vessels without the use of radar（）the estuary.

A.to get
B.to approach
C.to proceed
D.to close