单项选择题
The Earth’s irregular heating is caused by （）.
A.the time of day
B.the seasons
C.geography
D.All of the above
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The Earth has the shape of a(n) （）.
A.sphere
B.oblate spheroid
C.spheroid of revolution
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（）.
A.air gap
B.freeboard
C.penetration
D.water depth -
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The distance between the surface of the water and the tidal datum is the （）.
A.range of tide
B.height of tide
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