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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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
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