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
最新試題
During a period of whiteout，you should expect which of the following（）.
The distance from the still water level (corrected for tides and storm surge) to the bottom of the hull of a ship is the（）.
As these features are not all charted，special caution should be exercised （） vessels navigating in the vicinity.
The distance between any two meridians measured along a parallel of latitude and expressed in miles is the （）.
During daylight savings time the meridian used for determining the time is located farther （）.
A pilot vessel on pilotage duty shall show identity lights （）.
Areas enclosed by a long and short dashed magenta line indicate （）.
Clearance gauges at bridges indicate （）.
At last，the palm trees that fringe the natural harbor of Port Aloahoa come into view on the horizon lit by the setting sun.The meaning of this sentence is that （）.
For full information regarding the current circulation of the Indian Ocean,（） Sailing Direction,Current Atlas,etc.