单项选择题
Mariners not entering the port are（）to keep at least one mile off.
A.Advised B.Reported C.Complied D.Supplied
单项选择题 Many of the lights on this coast are placed so high as to be frequently obscured by（）.
单项选择题 Lines drawn through points on the Earth having the same atmospheric pressure are known as （）.
单项选择题 Light Lists for coastal waters are（）.
