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由金属(多为钢)制成的U形声学器件(见图),它能产生频率稳定单纯的纯音,提供频率标准。
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光学、声学
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tuning fork
音叉
pitchfork
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tuning fork
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unidentified reading frame
unidentified source
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unidimensional-logical theory
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unidirection
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unidirectional airflow cleanroom
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unidirectional dictionary
unidirectionality
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unidirection traveling wire electrical discharge machining
UNIDROIT
UNIFAC
unifactor
unifactor theory
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