航海英语航海学基本知识单项选择题每日一练(2019.01.24)

单项选择题
An orange and white buoy marking a danger area will have what symbol on it?（）
A.Open-faced diamond
B.Diamond with a cross
C.Circle
D.Square
单项选择题
A V-shaped ripple with the point of the V pointing upstream in a river may indicate a（）.
A.submerged rock，not dangerous to navigation
B.sunken wreck，not dangerous to navigation
C.towed-under buoy
D.All of the above
单项选择题
A vessel is（）when she is not at anchor，made fast to the shore，or aground.
A.underway
B.making way
C.dead in the water
D.a power driven vessel
单项选择题
A special purpose buoy shall be（）.
A.lighted with a white light
B.striped black and red
C.lighted with a red light
D.yellow
单项选择题
An orange and white buoy indicating a vessel-exclusion area will be marked with what symbol? （）
A.Open-faced diamond
B.Diamond with a cross
C.Circle
D.Square