单项选择题
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
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 （）.
单项选择题 A line of position derived by radar range from an identified point on a coast will be a(n) （）.
