单项选择题

During the day，a vessel with a tow over 200 meters in length will show（）.

A.a black ball
B.a diamond shape
C.two cones，apexes together
D.one cone，apex upward

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At sea，you are approaching a small vessel and see that ...

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B.Keep clear of the vessel because it has a diver down
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号灯与号型

During the day，a vessel with a tow over 200 meters in length will show（）.