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
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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
A.air gap
B.freeboard
C.penetration
D.water depth
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Conditions for crossing a rough bar are usually best at （）.
The height of tide is the （）.
A pilot vessel on pilotage duty at night will show sidelights and a sternlight （）.
AFTER DROPPING THE PILOT means （）.
The distance between any two meridians measured along a parallel of latitude and expressed in miles is the （）.
The Earth’s irregular heating is caused by （）.
Above-normal tides near the center of a hurricane maybe caused by the （）.
During a period of whiteout，you should expect which of the following（）.
For full information regarding the current circulation of the Indian Ocean,（） Sailing Direction,Current Atlas,etc.
The distance between any two meridians measured along a parallel of latitude （）.