A. the angle between the horizontal and the line of sight to the visible horizon
B. index error
C. parallax
D. terrestrial refraction
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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
On a voyage from Capetown to London，the favorable ocean current off the coast of Africa is the （）.
An occulting light is one in which （）.
Attention is called to the fact that in many cases pipelines are not （） and charted depths may be decreased by up to 2 meters．
The distance from the still water level (corrected for tides and storm surge) to the bottom of the hull of a ship is the（）.
The distance between the surface of the water and the tidal datum is the （）.
In Admiralty Sailing Directions，bands is the word used to indicate（）marking．
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（）.
The height of a light is measured from which reference plane?（）
A vessel not to impede the passage of another vessel is not relieved （） taking collision-avoiding action.
A pilot vessel on pilotage duty at night will show sidelights and a sternlight （）.