Preferred channel marks are aids to navigation which all following marks other than（）．<br>A:channel junctions<br>B:bifurcations<br>C:fishing traps<br>D:wrecks or obstructions

Preferred channel marks are aids to navigation which all following marks other than（）．
A:channel junctions
B:bifurcations
C:fishing traps
D:wrecks or obstructions

出自：海船船员证

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