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单词
h and d speed
释义
h and d speed
\|āchənˈdē-\
noun
Usage:
usually capitalized H&D
Etymology:
after Ferdinand
H
urter
and
Charles
D
riffield
fl
1890
:
a number indicating the sensitivity of a photographic emulsion determined by the method of Hurter and Driffield
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更新时间:2024/9/24 16:27:05