单项选择题
When making landfall at night，you can determine if a light is a major light or an offshore buoy by（）.
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
单项选择题 When entering from seaward，a buoy displaying a single-flashing red light would indicate （）.
单项选择题 When entering a channel from seaward，the numbers on buoys（）.
单项选择题 When approaching a preferred-channel buoy，the best channel is NOT indicated by the（）.
