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?（）
1、A light used to signal passing intenti
A light used to signal passing intentions must be an（）.Aalternating red and yellow lightBalternating white and yellow lightCall-round white or yellow lightDall-round white light only
2、Mariners should ensure correct（）of aid
Mariners should ensure correct（）of aids to navigation during twilight periods when some lighted aids to navigation are lit while others are not.AidentificationBdistinctionCdiscriminationDclearly seeing
3、Please shift some light cargo to fill
Please shift some light cargo to fill it（）.AinBupCoverDwith
4、The period of a lighted aid to navigat
The period of a lighted aid to navigation refers to the（）.Adate of construction or establishmentBlength of time between flashes of the lightCtime required for the longest flash of each cycleDtime required for the light to complete each cycle
5、A light used to signal passing intenti
A light used to signal passing intentions must be an （）.Aall-round yellow light onlyBall-round white light onlyCall-round blue light onlyDalternating red and yellow light
6、As some countries attempt to shift awa
As some countries attempt to shift away from natural gas or petroleum energy systems toward coal-based systems, the need for coal slurry(煤泥) ...