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中国青少年发展基金会于1989年10月发起并组织实施的一项社会公益事业。
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frequency modulation radio
frequency modulation screening
frequency modulator
frequency multiplication
frequency multiplier
frequency number
frequency of access
frequency of alternating current
frequency of an event
frequency of an oscillation
frequency of a wave
frequency of disease occurrence
frequency offset
frequency of language constituents
frequency of occurrence
frequency of operation
frequency of samples
frequency of urinatior
frequency plane
frequency plane mask
frequency-plane mask
frequency polygon
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frequency pushing
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