单选题A pilot vessel on pilotage duty at night will show sidelights and a sternlight （）.Awhen at anchorBonly when making wayCat any time when underwayDonly when the identifying lights are not being shown
单选题
A pilot vessel on pilotage duty at night will show sidelights and a sternlight （）.
A
when at anchor
B
only when making way
C
at any time when underway
D
only when the identifying lights are not being shown
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