单项选择题
A pilot vessel may continue to sound an identity signal if she is （）.
A.underway，but not making way B.aground C.being towed D.not engaged in pilotage duty
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) （）.
单项选择题 A head on situation shall be deemed to exist at night when a power-driven vessel sees another power-driven vessel ahead and （）.
