The geoid surface is treated as the surface of mean sea level, which is important for measuring elevations or heights. （ ）
The geoid surface is treated as the surface of mean sea level, which is important for measuring elevations or heights. （ ）
正高是以地球不规则的大地水准面（geoid）为基准面的高程系统。（ ）
正高是以地球不规则的大地水准面（geoid）为基准面的高程系统。（ ）
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