單項選擇題A celestial body will cross the prime vertical circle when the latitude is numerically （）.

A.Greater than the declination and both are of the same name
B.Less than the declination and both are of the same name
C.Greater than the declination and both are of contrary name
D.Less than the declination and both are of contrary name


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1.單項選擇題（） is not likely to be a methods of Traffic Separation.

A.Separation of opposing streams of traffic by separation zones or lines
B.The separation of through traffic from local traffic by provision of inshore traffic zones
C.Division of traffic from several different direction into sectors
D.Control of routing traffic through shipping routes

3.單項選擇題（） is a defined area within which ships must use particular caution and should follow the recommended direction of traffic flow.

A.Recommended Direction of Traffic Flow
B.Roundabout
C.Separation Zone or Line
D.Precautionary Area

4.單項選擇題When using a buoy as an aid to navigation which of the following should be considered?（）

A.The buoy should be considered to always be in the charted location
B.If the light is flashing，the buoy should be considered to be in the charted location
C.The buoy may not be in the charted position
D.The buoy should be considered to be in the charted position if it has been freshly painted

5.單項選擇題When navigating a vessel，you（）.

A.can always rely on a buoy to be on station
B.can always rely on a buoy to show proper light characteristics
C.should assume a wreck buoy is directly over the wreck
D.should never rely on a floating aid to maintain its exact position