单选题Preferred channel buoys indicate the preferred channel to transit by（）.Aodd or even numbersBthe color of their top bandCthe location of the buoy in the channel junctionDthe buoy's light rhythms
单选题
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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