A pilot vessel on pilotage duty shall show identity lights （）.<br>A:at any time while underway<br>B:while at anchor<br>C:while alongside a vessel<br>D:All of the above

A pilot vessel on pilotage duty shall show identity lights （）.
A:at any time while underway
B:while at anchor
C:while alongside a vessel
D:All of the above

出自：海船船员证

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