（），an even closer approximation of the Earth, has an irregular surface, which is affected by irregularities in the density of the Earth’s crust and mantle.A:The geoid B:Mean sea level C:Spheroid D:Datum 答案: The geoid

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（ ），an even closer approximation of the Earth, has an irregular surface, which is affected by irregularities in the density of the Earth’s crust and mantle.A:The geoid B:Mean sea level C:Spheroid D:Datum 答案: The geoid