单项选择题
The height of a light is measured from which reference plane?（）
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 -
单项选择题
The Earth has the shape of a(n) （）.
A.sphere
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D.oblate eggoid -
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The distance from the still water level (corrected for tides and storm surge) to the bottom of the hull of a ship is the（）.
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