A.Mean low water
B.Mean high water
C.Average water level
D.Geographical sea level
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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
A.difference in longitude
B.mid-longitude
C.departure
D.meridian angle
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During a period of whiteout，you should expect which of the following（）.
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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 （）.
Information on the operating times and characteristics of foreign radiobeacons can be found in which publication? （）
The distance between the surface of the water and the tidal datum is the （）.
A pilot vessel on pilotage duty at night will show sidelights and a sternlight （）.
In Admiralty Sailing Directions，bands is the word used to indicate（）marking．
As these features are not all charted，special caution should be exercised （） vessels navigating in the vicinity.
On a voyage from Halifax,N.S.,to Dakar,West Africa,the Canary Current will （）.
A tug is to assist in docking an oceangoing vessel on a hawser. The greatest danger to the tug is （）.