A.date of construction or establishment
B.length of time between flashes of the light
C.time required for the longest flash of each cycle
D.time required for the light to complete each cycle
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A.under existing visibility conditions
B.under perfect visibility
C.with ten miles visibility
D.with fifteen miles visibility
A.nominal range
B.luminous range
C.charted range
D.geographic range
A.glare from background lighting
B.existing visibility conditions
C.elevation of the light
D.observer's height of eye
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.odd or even numbers
B.the color of their top band
C.the location of the buoy in the channel junction
D.the buoy's light rhythms
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When making landfall at night，you can determine if a light is a major light or an offshore buoy by（）.
The points on the earth’s surface where the magnetic dip is 90° are（）.
（） 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.
The time required for a lighted aid to complete a full cycle of light changes is listed in the Light List as the（）.
Traffic separation schemes adopted by the IMO are listed in（）.
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.
The recording fathometer produces a graphic record of the（）.
When navigating a vessel，you（）.
What is a lighted safe water mark fitted with to aid in its identification（）.