单项选择题
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
单项选择题 A pilot vessel on pilotage duty at night will show sidelights and a sternlight （）.
单项选择题 A pilot vessel may continue to sound an identity signal if she is （）.
单项选择题 A navigator fixing a vessel’s position by radar （）.
