A vessel engaged in fishing during the day would show（）.<br>A:one black ball<br>B:two cones with bases together<br>C:a cone，apex downward<br>D:two cones，apexes together

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

出自：海船船员证

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