单项选择题
A.can always rely on a buoy to be on station B.can always rely on a buoy to show proper light characteristics C.should assume a wreck buoy is directly over the wreck D.should never rely on a floating aid to maintain its exact position
A.the intensity of the light B.checking the period and characteristics against the Light List C.the color，because the buoy will have only a red or a green light D.Any of the above can be used to identify the light
A.a junction with the preferred channel to the left B.a sharp turn in the channel to the right C.the starboard side of the channel D.a wreck to be left on the vessel's port side