A.the primary great circle of the Earth perpendicular to the axis
B.the line to which all celestial observations are reduced
C.the line from which a celestial body's altitude is measured
D.All of the above
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A.Flashing red lights upstream and fixed red lights downstream
B.Yellow unlighted buoys
C.Signs and/or flashing red lights
D.Red daymarks upstream and green daymarks downstream
A.Indicates the limits of the navigable channel
B.Indicates a danger area
C.Is used to identify the characteristics of the light
D.Serves no significant purpose
A.Mercator
B.Gnomonic
C.Azimuthal
D.Lambert conformal
A.keep the buoy on the vessel's starboard side when approaching a port and on the vessel's port side when leaving
B.keep the buoy on the vessel's port side when approaching a port and on the vessel's starboard side when leaving
C.keep the buoy on the vessel's starboard side when approaching and leaving
D.keep the buoy on the vessel's port side when approaching and leaving
A.magenta
B.deep red
C.bright red
D.red
最新試題
The four standard light colors used for lighted aids to navigation are red，green，white，and （）.
What is an ebb current（）.
（） is a defined area within which ships must use particular caution and should follow the recommended direction of traffic flow.
（） is a circular traffic lane used at junctions of several routes，within which traffic moves counterclockwise around a separation point or zone.
On a chart，the characteristic of the light on a lighthouse is shown as flashing white with a red sector.The red sector（）.
The recording fathometer produces a graphic record of the（）.
How would you pass a red buoy in the maritime buoyage system“A” （）.
What area of the earth cannot be shown on a standard Mercator chart（）.
You determine your vessel’s position by taking a range and bearing to a buoy.Your position will be plotted as a（n）（）.
You have been informed that dredging operations may be underway in your vicinity.Which buoy indicates the dredging area（）.