单选题A vessel engaged in fishing during the day would show（）.Aone black ballBtwo cones with bases togetherCa cone，apex downwardDtwo cones，apexes together
单选题
A vessel engaged in fishing during the day would show（）.
A
one black ball
B
two cones with bases together
C
a cone，apex downward
D
two cones，apexes together
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