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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As these features are not all charted，special caution should be exercised （） vessels navigating in the vicinity.
Information on the operating times and characteristics of foreign radiobeacons can be found in which publication? （）
The height of a light is measured from which reference plane?（）
During daylight savings time the meridian used for determining the time is located farther （）.
The distance between the surface of the water and the tidal datum is the （）.
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 （）.
A pilot vessel on pilotage duty shall show identity lights （）.
The distance between any two meridians measured along a parallel of latitude and expressed in miles is the （）.
Attention is called to the fact that in many cases charted depths may be decreased by up to （）.
The Earth’s irregular heating is caused by （）.