单选题A vessel constrained by her draught may，in addition to the lights prescribed for power-driven vessels in Rule 23，exhibit where they can best be seen（）or a cylinder.Atwo all-round red lights in a vertical lineBthree all-round red lights in a vertical lineCtwo all-round yellow lights in a vertical lineDthree all-round green lights in a vertical line
单选题
A vessel constrained by her draught may，in addition to the lights prescribed for power-driven vessels in Rule 23，exhibit where they can best be seen（）or a cylinder.
A
two all-round red lights in a vertical line
B
three all-round red lights in a vertical line
C
two all-round yellow lights in a vertical line
D
three all-round green lights in a vertical line
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