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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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更多 “ 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 diamondB.three shapes in a vertical line; the highest and lowest are red balls，and the middle one is a white diamondC.three black balls in a vertical lineD.two black balls in a vertical line ” 相关考题
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