A vessel servicing a pipeline during the day shall display（）.<br>A:three black shapes in a vertical line; the highest and lowest are balls，and the middle one is a diamond<br>B:three shapes in a vertical line; the highest and lowest are red balls，and the middle one is a white diamond<br>C:three black balls in a vertical line<br>D:two black balls in a vertical line

A vessel servicing a pipeline during the day shall display（）.
A:three black shapes in a vertical line; the highest and lowest are balls，and the middle one is a diamond
B:three shapes in a vertical line; the highest and lowest are red balls，and the middle one is a white diamond
C:three black balls in a vertical line
D:two black balls in a vertical line

出自：海船船员证

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