A.glare from background lighting
B.existing visibility conditions
C.elevation of the light
D.observer's height of eye
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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.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
A.the lines of force cross the equator on a 0°-180°alignment
B.the quadrantal error is 0°
C.there is no vertical component of the Earth's magnetic field
D.the intercardinal headings have less than 1°
最新試題
Which statement concerning current is TRUE（）.
You determine your vessel’s position by taking a range and bearing to a buoy.Your position will be plotted as a（n）（）.
What area of the earth cannot be shown on a standard Mercator chart（）.
When a buoy marks a channel bifurcation，the preferred channel is NOT indicated by（）.
Restricted areas at locks and dams are indicated by（）.
Which buoy will NOT display white retro reflective material（）.
Which position includes the effects of wind and current（）.
When entering a channel from seaward，the numbers on buoys（）.
When approaching a preferred-channel buoy，the best channel is NOT indicated by the（）.
The equator is（）.