航海英语航海学章节练习(2019.03.11)

单项选择题
A position obtained by applying only your vessel’s course and speed to a known position is a （）.
A.dead-reckoning position
B.fix
C.probable position
D.running fix
单项选择题
The nominal range of a light may be accurately defined as the maximum distance at which a light may be seen（）.
A.under existing visibility conditions
B.under perfect visibility
C.with ten miles visibility
D.with fifteen miles visibility
单项选择题
A structure，usually made of stone，or cement pilings，which extends from the bank at approximately right angles to the current is called a（）.
A.dike
B.revetment
C.cutoff
D.crib
单项选择题
What describes an accurate position that is NOT based on any prior position? （）
A.Dead-reckoning position
B.Estimated position
C.Fix
D.Running fix
单项选择题
A mid-channel buoy，if lighted，will show a（）.
A.fixed red light
B.Morse (A) white light
C.green light
D.flashing red light
单项选择题
The period of a lighted aid to navigation refers to the（）.
A.date of construction or establishment
B.length of time between flashes of the light
C.time required for the longest flash of each cycle
D.time required for the light to complete each cycle
单项选择题
The approximate positions of the stars are based on sidereal time，which is based upon rotation of the Earth relative to（）.
A.winter solstice
B.autumnal equinox
C.summer solstice
D.vernal equinox
单项选择题
A star is observed at lower transit. The line of position derived from this sight is（）.
A.on the prime vertical
B.a latitude line
C.a longitude line
D.of no special significance
单项选择题
Which statement is TRUE concerning equatorial tides（）.
A.They occur when the Sun is at minimum declination north or south
B.They occur when the Moon is at maximum declination north or south
C.The difference in height between consecutive high or low tides is at a minimum
D.They are used as the basis for the vulgar establishment of the port
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