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 distance between any two meridians measured along a parallel of latitude （）.
An occulting light is one in which （）.
The height of eye correction is smaller than geometrical dip because of （）.
Conditions for crossing a rough bar are usually best at （）.
Attention is called to the fact that in many cases pipelines are not （） and charted depths may be decreased by up to 2 meters．
For full information regarding the current circulation of the Indian Ocean,（） Sailing Direction,Current Atlas,etc.
The Earth’s irregular heating is caused by （）.
During daylight savings time the meridian used for determining the time is located farther （）.
The height of a light is measured from which reference plane?（）