英语词汇“diapason normal”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	diapason normal
释义	diapason normal noun Etymology: French, literally, normal diapason : the standard pitch adopted by the French government in 1859 establishing A above middle C as 435 vibrations per second — called also French pitch, international pitch, low pitch
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