单选题By day，you sight a vessel displaying three shapes in a vertical line. The top and bottom shapes are balls，and the middle shape is a diamond. It could be a（）.Avessel trollingBmineclearing vesselCtrawlerDvessel engaged in replenishment at sea
单选题
By day，you sight a vessel displaying three shapes in a vertical line. The top and bottom shapes are balls，and the middle shape is a diamond. It could be a（）.
A
vessel trolling
B
mineclearing vessel
C
trawler
D
vessel engaged in replenishment at sea
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