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
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The meaning of ebb tide is that （）.
The period at high or low tide during which there is no change in the height of the water is called the （）.
Clearance gauges at bridges indicate （）.
Attention is called to the fact that in many cases charted depths may be decreased by up to （）.
Areas enclosed by a long and short dashed magenta line indicate （）.
The height of a light is measured from which reference plane?（）
During a period of whiteout，you should expect which of the following（）.
The distance between any two meridians measured along a parallel of latitude and expressed in miles is the （）.
The distance from the still water level (corrected for tides and storm surge) to the bottom of the hull of a ship is the（）.
Conditions for crossing a rough bar are usually best at （）.