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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In Admiralty Sailing Directions，bands is the word used to indicate（）marking．
Attention is called to the fact that in many cases pipelines are not （） and charted depths may be decreased by up to 2 meters．
AFTER DROPPING THE PILOT means （）.
Areas enclosed by a long and short dashed magenta line indicate （）.
For full information regarding the current circulation of the Indian Ocean,（） Sailing Direction,Current Atlas,etc.
During daylight savings time the meridian used for determining the time is located farther （）.
On a voyage from Capetown to London，the favorable ocean current off the coast of Africa is the （）.
The distance between any two meridians measured along a parallel of latitude （）.
The period at high or low tide during which there is no change in the height of the water is called the （）.
A vessel not to impede the passage of another vessel is not relieved （） taking collision-avoiding action.