单项选择题
A.the centerline of a navigable channel B.the starboard side of a channel C.a prominent object of navigational interest that has no lateral significance D.area of a channel where passing another vessel is permitted
A power-driven vessel，when towing astern，shall show（）.A...
单项选择题A power-driven vessel，when towing astern，shall show（）.
A.two towing lights in a vertical line B.a towing light in a vertical line above the sternlight C.two towing lights in addition to the sternlight D.a small white light in lieu of the sternlight
A power-driven vessel underway shall keep out of the wa...
单项选择题A power-driven vessel underway shall keep out of the way of（）.
A.a vessel restricted in her ability to maneuver B.a vessel under command C.a passenger ship D.a seaplane on the water
A power-driven vessel towing another vessel astern (tow...
单项选择题A power-driven vessel towing another vessel astern (tow less than 200 meters) shall show （）.
A.three masthead lights in a vertical line instead of either the forward or after masthead light B.two masthead lights in a vertical line instead of either the forward or after masthead lights C.two towing lights in a vertical line at the stern D.a small white light aft of the funnel
