单选题A partly submerged vessel or object being towed，which is not readily noticeable，shall show （） .Ayellow lights at each endBtwo red lights in a vertical lineCa black ballDa diamond shape
单选题
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
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