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科学时代收录了3405121条科普词条，基本涵盖了常见科普常识及英语词汇的翻译，是科学学习和研究的有利工具。
frequency relay
frequency relay{=FR}
frequency repeatability
frequency reproducibility
frequency reproduction
frequency resolution
Frequency resolved capacitance measurements
frequency resolved optical gating
frequency resolved optical gating{=FROG}
frequency, resonant
frequency respone
Frequency response
frequency response
frequency response analysis
frequency-response analyzer
frequency response and 3 dB bandwidth
frequency-response calibration
frequency-response characteristic
frequency response characteristic
frequency-response compensation
frequency response degradation
frequency response estimate
frequency response{=FR}
frequency response function
Frequency response function
frequency response function {=FRF}
frequency response locus
frequency response method
frequency response of microphone
frequency response of network
frequency response range
Frequency responses
frequency response spectrum
frequency response square
frequency response test
frequency restoration
frequency reuse
frequency ringing
frequency ringing, harmonic ringing
frequency ringing (harmonic ringing)
frequency-rstepped waveform
frequency run
frequency scale
frequency scan
frequency scanning
frequency scanning oscillator
frequency-scan radar
frequency scan radar
frequency selecting connector
frequency selection
frequency-selective
frequency selective
frequency-selective amplifier
frequency selective amplifier
frequency selective channel
Frequency selective circuits
frequency-selective composite material
frequency-selective device
frequency-selective element
frequency-selective fading
frequency selective fading
frequency selective fading channel
frequency selective integrated circuit
frequency selective surface
frequency selective voltmeter
frequency selectivity
frequency sensitive detector
frequency-sensitive device
frequency-sensitive reflector
frequency sensitive relay
frequency sensitive rheostat
frequency-sensitive starting
frequency sensitivity
frequency separation
frequency separation of syn pulse
frequency separator
frequency series
frequency, servo-corner
frequency setting
frequency setting drift
frequency setting matrix
frequency set value
frequency sharing
frequency shield
frequency shift
frequency shift coded data
frequency shift coding
frequency shift communication system
frequency shift converter
frequency shift data
frequency shifted feedback
frequency shifted feedback laser
frequency shifter
Frequency shifters
frequency shifter wavelength filter
frequency shift estimation
frequency shift generating circuit
Frequency shifting
frequency shifting
frequency shifting acoustooptic modulator
frequency shift key
frequency shift keyed modulation
frequency-shift keyer
frequency shift keying
frequency shift keying (FSD)
frequency shift keying{=FSD}
frequency shift keying{=FSK}
frequency-shift keying{=FSK}
frequency shift keying {=FSK}
frequency-shift keying {=FSK}
frequency-shift keying (FSK)
Frequency Shift Keying{=FSK}
frequency shift keying （FSK）
frequency shift modulation{=FSM}
frequency shift modulator
frequency-shift readout circuit
frequency shift signaling
frequency shift signalling
frequency shift system
frequency shift telegraphy
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