航海英语航海学基本知识章节练习(2018.02.05)

单项选择题
A light having characteristics which include color variations is defined as（）.
A.switching
B.alternating
C.oscillating
D.fluctuating
单项选择题
Buoys which mark dredging areas are painted（）.
A.black
B.yellow
C.green
D.red
单项选择题
A spherical buoy may be（）.
A.numbered
B.lettered
C.green
D.red
单项选择题
A light characteristic of composite group flashing indicates that there is a(n)（）.
A.sharp turn in the channel
B.narrowing in the channel at that point
C.junction in the channel
D.obstruction that must be left to port
单项选择题
A great circle track provides the maximum saving in distance on（）.
A.easterly courses in high latitudes
B.southerly courses in high latitudes
C.westerly courses in low latitudes
D.easterly courses in low latitudes that cross the equator
单项选择题
Buoys are marked with reflective material to assist in their detection by searchlight. Which statement is TRUE? （）
A.A safe-water buoy will display red and white vertical stripes of reflective material
B.All reflective material is white because it is the most visible at night
C.A special-purpose mark will display either red or green reflective material to agree with its shape
D.A preferred-channel buoy displays either red or green reflective material to agree with the top band of color
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
单项选择题
A plane that cuts the Earth’s surface and passes through the poles will always form（）.
A.the equator
B.a loxodromic curve
C.a small circle
D.a meridian
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
Branford reef is（）.
A.a hard sand shoal marked with a light
B.completely submerged at all stages of the tide
C.surrounded by rocks awash at low water spring tides
D.a small，low，sandy islet surrounded by shoal water