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
（） is a defined area within which ships must use particular caution and should follow the recommended direction of traffic flow.
When latitude and longitude are used，these shall be expressed in（）（and decimals of a minute if necessary），north or south of the Equator and east or west of Greenwich.
A celestial body will cross the prime vertical circle when the latitude is numerically （）.
When a buoy marks a channel bifurcation，the preferred channel is NOT indicated by（）.
The equator is（）.
What describes a flood current（）.
You have been informed that dredging operations may be underway in your vicinity.Which buoy indicates the dredging area（）.
Restricted areas at locks and dams are indicated by（）.
The recording fathometer produces a graphic record of the（）.
When making landfall at night，you can determine if a light is a major light or an offshore buoy by（）.