单项选择题
A.Figure eight turn B.Round turn C.Racetrack turn D.Williamson turn
A.Carbon dioxide B.Distilled water C.Fresh water D.Salt water
A.there is reason to believe that the latter is not capable of carrying out the watchkeeping duties effectively B.the ship is fitted with automatic steering C.there is daylight or darkness D.at no time shall the bridge be left unattended