单项选择题
Some lights used as aids to marine navigation have a red sector to indicate a danger area. The limits of a colored sector of a light are listed in the Light List in which of the following manners?（）
A.Geographical positions outlining the area of the sector B.True bearings as observed from the ship toward the light C.An outline of the area of the sector D.True bearings as observed from the light toward the ship
单项选择题 On entering from seaward，a starboard side daymark will（）.
单项选择题 Navigation lights must be displayed in all weathers from sunset to sunrise. They also（）.
单项选择题 Lighted information markers show（）.
