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1956 Huanghai mean sea level
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1956 Huanghai mean sea level
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1956 Huanghai mean sea level
1956黄海平均海面
由青岛验潮站1950~1956年潮汐观测数据导出的当地平均海面。是中国首个全国统一的高程起算面,1957年启用。
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