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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In Admiralty Sailing Directions,bands is the word used to indicate()marking.
The period at high or low tide during which there is no change in the height of the water is called the ().
The Earth’s irregular heating is caused by ().
During a period of whiteout,you should expect which of the following().
Information on the operating times and characteristics of foreign radiobeacons can be found in which publication? ()
Conditions for crossing a rough bar are usually best at ().
The meaning of ebb tide is that ().
Clearances of bridges and overhead cables below Bonneville Dam refer to heights in feet above mean ().
A vessel not to impede the passage of another vessel is not relieved () taking collision-avoiding action.
Attention is called to the fact that in many cases charted depths may be decreased by up to ().