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（）.<br>A:vessel trolling<br>B:mineclearing vessel<br>C:trawler<br>D:vessel engaged in replenishment at sea

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

出自：海船船员证

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