航海英语航海学基本知识章节练习(2019.04.30)

单项选择题
A rock and sand structure extending from the bank of the river toward the channel is known as a（）.
A.wingdam
B.towhead
C.cutoff
D.landwall
单项选择题
A nun buoy will（）.
A.be green in color
B.have an even number
C.be left to port when entering from seaward
D.be cylindrical in shape
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 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
A lighthouse can be identified by its（）.
A.painted color
B.light color and phase characteristic
C.type of structure
D.All of the above
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
单项选择题
A lateral system buoy displaying a quick light（）.
A.should be passed close aboard on either side
B.indicates that special caution is required
C.is used at a channel bifurcation or junction
D.is painted with red and white vertical stripes
单项选择题
A gnomonic projection is based on a(n)（）.
A.plane tangent at one point
B.cylinder tangent at the equator
C.cone tangent at one parallel
D.infinite series of cones tangent at selected parallels
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