单选题A vessel,which is unable to maneuver due to some exceptional circumstance,shall exhibit ().Aduring the day,three balls in a vertical lineBduring the day,three shapes,the highest and lowest being balls and the middle being a diamondCwhen making way at night,two all-round red lights,sidelights,and a sternlightDwhen making way at night,masthead lights,sidelights,and a sternlight

单选题
A vessel,which is unable to maneuver due to some exceptional circumstance,shall exhibit ().
A

during the day,three balls in a vertical line

B

during the day,three shapes,the highest and lowest being balls and the middle being a diamond

C

when making way at night,two all-round red lights,sidelights,and a sternlight

D

when making way at night,masthead lights,sidelights,and a sternlight


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