A survey (special purpose mark) buoy（）.<br>A:must be lighted<br>B:may have a flashing red light<br>C:may have a fixed white light<br>D:None of the above

A survey (special purpose mark) buoy（）.
A:must be lighted
B:may have a flashing red light
C:may have a fixed white light
D:None of the above

出自：海船船员证

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