Which buoy will NOT display white retro reflective material（）.<br>A:Safe water mark<br>B:Isolated danger mark<br>C:Preferred channel mark<br>D:Daymark of no lateral significance

Which buoy will NOT display white retro reflective material（）.
A:Safe water mark
B:Isolated danger mark
C:Preferred channel mark
D:Daymark of no lateral significance

出自：海船船员证

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