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
When entering a channel from seaward，the numbers on buoys（）.
The equator is（）.
Which position includes the effects of wind and current（）.
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.
You should plot your dead reckoning position（）.
The time required for a lighted aid to complete a full cycle of light changes is listed in the Light List as the（）.
When navigating a vessel，you（）.
Which buoy will NOT display white retro reflective material（）.
A celestial body will cross the prime vertical circle when the latitude is numerically （）.
Depiction of TSS's on charts uses（）as the primary color.