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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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°
A.buoys close at hand
B.fixed known objects on shore
C.buoys at a distance
D.All of the above
A.running fix
B.fix
C.estimated position
D.assumed position
最新試題
What is a lighted safe water mark fitted with to aid in its identification（）.
What describes a flood current（）.
The points on the earth’s surface where the magnetic dip is 90° are（）.
Which of the following are data layer categories to be displayed on ECDIS（）．
What area of the earth cannot be shown on a standard Mercator chart（）.
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 equator is（）.
When using a buoy as an aid to navigation which of the following should be considered?（）
On a chart，the characteristic of the light on a lighthouse is shown as flashing white with a red sector.The red sector（）.
Which position includes the effects of wind and current（）.