单项选择题

A power driven vessel when towing and the length of the tow exceeds 200 meters shall exhibit during daylight hours where they can best be seen which of the following shapes? （）

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

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号灯与号型

A power driven vessel when towing and the length of the tow exceeds 200 meters shall exhibit during daylight hours where they can best be seen which of the following shapes? （）