A.under existing visibility conditions
B.under perfect visibility
C.with ten miles visibility
D.with fifteen miles visibility
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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
A.Orange
B.White
C.Red
D.Alternating yellow and white
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（） is a defined area within which ships must use particular caution and should follow the recommended direction of traffic flow.
（） is not likely to be a methods of Traffic Separation.
When navigating a vessel，you（）.
The four standard light colors used for lighted aids to navigation are red，green，white，and （）.
What is a lighted safe water mark fitted with to aid in its identification（）.
When navigating a vessel，you（）.
Which statement concerning current is TRUE（）.
（） is a circular traffic lane used at junctions of several routes，within which traffic moves counterclockwise around a separation point or zone.
Traffic separation schemes adopted by the IMO are listed in（）.
When using a buoy as an aid to navigation which of the following should be considered?（）