航海英语航海学基本知识章节练习(2018.01.21)

单项选择题
Buoys which only mark the left or right side of the channel will never exhibit a light with which characteristic? （）
A.Flashing
B.Quick flashing
C.Composite group flashing
D.Equal interval (isophase)
单项选择题
A lighted preferred-channel buoy may show a（）.
A.fixed red light
B.Morse (A) white light
C.composite group-flashing light
D.yellow light
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 relative bearing is always measured from（）.
A.true north
B.magnetic north
C.the vessel's beam
D.the vessel's head
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
From your position you observe a rotating white and green light to the north. This light is most likely（）.
A.from a submarine on the surface
B.the light at Southeast Point
C.at an airport
D.on a coastal patrol vessel
单项选择题
A line of position formed by sighting two charted objects in line is called a(n)（）.
A.relative bearing
B.range line
C.track line
D.estimated position
单项选择题
A plane that cuts the Earth’s surface at any angle and passes through the center will always form（）.
A.the equator
B.a great circle
C.a small circle
D.a meridian
单项选择题
How is the intensity of a light expressed in the Light Lists?（）.
A.Luminous range
B.Geographic range
C.Nominal range
D.Meteorological range
单项选择题
A preferred-channel buoy may be（）.
A.lettered
B.spherical
C.showing a white light
D.All of the above