航海英语航海学章节练习(2018.03.06)

单项选择题
A star that suddenly becomes several magnitudes brighter and then gradually fades is a（）.
A.double star
B.variable star
C.nova
D.nebula
单项选择题
（）is the process by which the position of the vessel at any moment is found by applying the last well-determined position to the run that has been made since，using for this purpose the ship’s course and the distance being those indicated by log.
A.dead reckoning
B.dead weight
C.dead slow ahead
D.dead slow astern
单项选择题
The velocity of the current in large coastal harbors is（）.
A.predicted in Tidal Current Tables
B.unpredictable
C.generally constant
D.generally too weak to be of concern
单项选择题
A spherical buoy may be（）.
A.numbered
B.lettered
C.green
D.red
单项选择题
Priming of the tides occurs（）.
A.at times of new and full Moon
B.when the Earth，Moon，and Sun are lying approximately on the same line
C.when the Moon is between first quarter and full and between third quarter and new
D.when the Moon is between new and first quarter and between full and third quarter
单项选择题
A large group of stars revolving around a center is known as a（）.
A.cluster
B.shower
C.constellation
D.galaxy
单项选择题
How would you pass a red buoy in the maritime buoyage system“A” （）.
A.keep the buoy on the vessel's starboard side when approaching a port and on the vessel's port side when leaving
B.keep the buoy on the vessel's port side when approaching a port and on the vessel's starboard side when leaving
C.keep the buoy on the vessel's starboard side when approaching and leaving
D.keep the buoy on the vessel's port side when approaching and leaving
单项选择题
In mid-ocean，the characteristics of a wave are determined by three factors. What is NOT one of these factors?（）
A.Effect of the moon's gravity
B.Fetch
C.Wind velocity
D.Length of time a wind has been blowing
单项选择题
Stand of the tide is that time when（）.
A.the vertical rise or fall of the tide has stopped
B.slack water occurs
C.tidal current is at a maximum
D.the actual depth of the water equals the charted depth
单项选择题
A bold reef is a reef（）.
A.with part of it extending above the water
B.that can be detected by water turbulence
C.that drops off sharply
D.perpendicular to the current