Which vessel may show three lights in a vertical line，the top and bottom being red and the middle being white? （）<br>A:A vessel engaged in diving operations<br>B:A pilot vessel<br>C:A vessel trawling<br>D:All of the above

Which vessel may show three lights in a vertical line，the top and bottom being red and the middle being white? （）
A:A vessel engaged in diving operations
B:A pilot vessel
C:A vessel trawling
D:All of the above

出自：海船船员证

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