英语词汇“h and d speed”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	h and d speed
释义	h and d speed \\|āchənˈdē-\ noun Usage: usually capitalized H&D Etymology: after Ferdinand Hurter and Charles Driffield fl 1890 : a number indicating the sensitivity of a photographic emulsion determined by the method of Hurter and Driffield
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