A. the angle between the horizontal and the line of sight to the visible horizon
B. index error
C. parallax
D. terrestrial refraction
您可能感興趣的試卷
你可能感興趣的試題
A.Mean low water
B.Mean high water
C.Average water level
D.Geographical sea level
A.the time of day
B.the seasons
C.geography
D.All of the above
A.sphere
B.oblate spheroid
C.spheroid of revolution
D.oblate eggoid
A.air gap
B.freeboard
C.penetration
D.water depth
A.range of tide
B.height of tide
C.charted depth
D.actual water depth
最新試題
Above-normal tides near the center of a hurricane maybe caused by the （）.
A pilot vessel on pilotage duty at night will show sidelights and a sternlight （）.
During a period of whiteout，you should expect which of the following（）.
An occulting light is one in which （）.
Clearances of bridges and overhead cables below Bonneville Dam refer to heights in feet above mean （）.
Conditions for crossing a rough bar are usually best at （）.
On a voyage from Capetown to London，the favorable ocean current off the coast of Africa is the （）.
The height of tide is the （）.
A vessel is entering port A for the first time and has a Pilot conning the vessel. The Master is unsure that the Pilot is taking sufficient action to prevent a collision. What should the Master do（）.
Attention is called to the fact that in many cases charted depths may be decreased by up to （）.