单选题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? （）Aa diamond shapeBtwo cones，apexes togetherCa black ballDone cone，apex upward
单选题
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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