单项选择题
Preferred channel buoys indicate the preferred channel to transit by（）.
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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相关考题
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单项选择题
Lighted white and orange buoys must show which color light?（）
A.Orange
B.White
C.Red
D.Alternating yellow and white -
单项选择题
In plotting a running fix，how many fixed objects are needed to take your lines of position from? （）
A.Three
B.Two
C.One
D.None -
单项选择题
At the magnetic equator there is no induced magnetism in the vertical soft iron because（）.
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°
