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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A pilot vessel on pilotage duty at night will show sidelights and a sternlight （）.
The distance between any two meridians measured along a parallel of latitude and expressed in miles is the （）.
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? （）
AFTER DROPPING THE PILOT means （）.
Clearances of bridges and overhead cables below Bonneville Dam refer to heights in feet above mean （）.
During daylight savings time the meridian used for determining the time is located farther （）.
In Admiralty Sailing Directions，bands is the word used to indicate（）marking．
Lateral movement of the vessel to leeward of its course defines （）.
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 （）.