单项选择题
A.Commandant of the Coast Guard B.Owner of the unit C.Nearest Coast Guard Marine Safety Office D.Captain of the nearest port
A red triangular daymark marks （）.A.the centerline of a...
单项选择题A red triangular daymark marks （）.
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.an area of a channel where passing another vessel is permitted
A rapid rise or fall of the barometer indicates（）.A.hea...
单项选择题A rapid rise or fall of the barometer indicates（）.
A.heavy rain within six hours B.a decrease in wind velocity C.a change in the present weather conditions D.that fog will soon set in
A radar range to a small，charted object such as a light...
单项选择题A radar range to a small，charted object such as a light will provide a line of position in which form? （）
A.Straight line B.Arc C.Parabola D.Hyperbola
