A.nominal range
B.luminous range
C.charted range
D.geographic range
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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
A.Three
B.Two
C.One
D.None
最新試題
Which position includes the effects of wind and current（）.
When navigating a vessel，you（）.
Traffic separation schemes adopted by the IMO are listed in（）.
When approaching a preferred-channel buoy，the best channel is NOT indicated by the（）.
When entering a channel from seaward，the numbers on buoys（）.
When using a buoy as an aid to navigation which of the following should be considered?（）
You should plot your dead reckoning position（）.
What is an ebb current（）.
On a chart，the characteristic of the light on a lighthouse is shown as flashing white with a red sector.The red sector（）.
The time required for a lighted aid to complete a full cycle of light changes is listed in the Light List as the（）.