Preferred channel buoys indicate the preferred channel to transit by（）.<br>A:odd or even numbers<br>B:the color of their top band<br>C:the location of the buoy in the channel junction<br>D:the buoy's light rhythms

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

出自：海船船员证

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