A partly submerged vessel or object being towed，which is not readily noticeable，shall show （） .<br>A:yellow lights at each end<br>B:two red lights in a vertical line<br>C:a black ball<br>D:a diamond shape

A partly submerged vessel or object being towed，which is not readily noticeable，shall show （） .
A:yellow lights at each end
B:two red lights in a vertical line
C:a black ball
D:a diamond shape

出自：海船船员证

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