英语词汇“ordnance datum”的英英意思、用法、释义、翻译、读音、例句、短语、词组-英语词典

单词	ordnance datum
释义	ordnance datum ordnance datum n (Surveying) mean sea level calculated from observation taken at Newlyn, Cornwall, and used as the official basis for height calculation on British maps. Abbreviation: OD EncyclopediaSeeOD
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