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社会问题
社会关系或社会环境失调,影响社会全体成员或部分成员的共同生活,破坏社会正常活动,妨碍社会协调发展的社会现象。
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frequency matching
frequency measurement
frequency measuring equipment
frequency meter
frequency meter, frequency counter
frequency method
frequency mixing
frequency-modulated cyclotron
frequency modulated oscillator
frequency modulated wave
frequency modulation
frequency modulation and control
frequency modulation and demodulation
frequency modulation, FM
frequency modulation laser
frequency-modulation laser interferometry
frequency modulation of hydro-generator unit
frequency modulation radar
frequency modulation radio
frequency modulation screening
frequency modulator
frequency multiplication
frequency multiplier
frequency number
frequency of access
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