英语词汇“altitude 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	altitude datum
释义	altitude datum altitude datum The arbitrary level from which vertical displacement is measured. The datum for height measurement is the terrain directly below the aircraft or some specified datum; for pressure altitude, the level at which the atmospheric pressure is 29.92 inches of mercury (1013.2 m.bs); and for true altitude, mean sea level. See also altitude.
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