单选题A jack-up drilling rig being towed must（）.Aturn off all lights that interfere with the navigation lightsBturn on all available working lights on deckCring the bell rapidly for five seconds once a minuteDdisplay two black diamonds in a vertical line during the day
单选题
A jack-up drilling rig being towed must（）.
A
turn off all lights that interfere with the navigation lights
B
turn on all available working lights on deck
C
ring the bell rapidly for five seconds once a minute
D
display two black diamonds in a vertical line during the day
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