单选题A vessel servicing a pipeline during the day shall display（）.Athree black shapes in a vertical line; the highest and lowest are balls，and the middle one is a diamondBthree shapes in a vertical line; the highest and lowest are red balls，and the middle one is a white diamondCthree black balls in a vertical lineDtwo black balls in a vertical line
单选题
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
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