A.tide is falling from high water to low water
B.tide is rising from low water to high water
C.tide is reaching to a highest level
D.tide is reaching to a lowest level
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A.depth of water at a specific time due to tidal effect
B.difference between the depth of the water and the area's tidal datum
C.difference between the depth of the water and the high water tidal level
D.difference between the depth of the water at high tide and the depth of the water at low tide
A. the angle between the horizontal and the line of sight to the visible horizon
B. index error
C. parallax
D. terrestrial refraction
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
最新試題
In Admiralty Sailing Directions，bands is the word used to indicate（）marking．
Attention is called to the fact that in many cases charted depths may be decreased by up to （）.
An occulting light is one in which （）.
The distance between the surface of the water and the tidal datum is the （）.
During daylight savings time the meridian used for determining the time is located farther （）.
The height of a light is measured from which reference plane?（）
Clearances of bridges and overhead cables below Bonneville Dam refer to heights in feet above mean （）.
The distance between any two meridians measured along a parallel of latitude （）.
A pilot vessel on pilotage duty at night will show sidelights and a sternlight （）.
The meaning of ebb tide is that （）.