单选题During the day，a vessel with a tow over 200 meters in length will show（）.Aa black ballBa diamond shapeCtwo cones，apexes togetherDone cone，apex upward
单选题
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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