A. the angle between the horizontal and the line of sight to the visible horizon
B. index error
C. parallax
D. terrestrial refraction
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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
A.range of tide
B.height of tide
C.charted depth
D.actual water depth
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Due to lapse of time the risk in these areas to surface navigation is now considered （）than the ordinary risks of navigation，but a very real risk still exists with regard to anchoring，fishing or any form of submarine or seabed activity.
An occulting light is one in which （）.
As these features are not all charted，special caution should be exercised （） vessels navigating in the vicinity.
Conditions for crossing a rough bar are usually best at （）.
The Earth has the shape of a(n) （）.
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 （）.
Above-normal tides near the center of a hurricane maybe caused by the （）.
The meaning of ebb tide is that （）.
Attention is called to the fact that in many cases charted depths may be decreased by up to （）.
On a voyage from Halifax,N.S.,to Dakar,West Africa,the Canary Current will （）.