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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 analysis
frequency analysis and control{=FAC}
frequency-analysis compaction
frequency analysis compaction
frequency analysis(seismic wave)
frequency analyzer
frequency anaylsis
frequency and magnitude estimation
Frequency and phase detector
frequency and time division data line
frequency and time division data link{=FATDDL}
frequency anomaly
frequency antenna apparatus
frequency aperture
frequency, assigned
frequency assignment
frequency assignment chart
frequency attenuation
frequency; audio
frequency-azimuth {=FRAZ} display
frequency azimuth intensity
frequency band
frequency band number
frequency bands
frequency band width
frequency bandwidth
frequency bar chart
frequency bar diagram
frequency, basic
frequency, beat
frequency behaviour
frequency bend
frequency bias
frequency bimirror
frequency booster
frequency, break
frequency breakdown
frequency bridge
frequency burst
frequency calibration
frequency calibration reference
Frequency capacitor multiplier
frequency, carrier
frequency carrier
frequency center
frequency, center
frequency chain
frequency-change oscillator
frequency-change-over switch
frequency changer
frequency changer circuit
frequency-changer crystal
frequency changer{=FC}
frequency changer; frequency converter
frequency changer-over switch
frequency changer set
frequency changer，frequency converter
frequency change signaling
frequency change signalling
frequency channel
frequency channel{=FC}
frequency channel signal
frequency characteristic
frequency characteristics
frequency characteristics conversion
frequency characteristics of load
frequency chart
Frequency charts
Frequency chirp
Frequency chirping
frequency circuit component
frequency circuit impedance
frequency circuit test device
frequency class
frequency coder
frequency coding
frequency coherence
frequency collapse
frequency comparator
frequency comparison
frequency comparison circuit
frequency compensation
Frequency compensation
frequency compensator
frequency component
frequency components
frequency compression demodulator{=FCD}
frequency condition
frequency content
frequency content of picture signal
Frequency control
frequency control
frequency control analysis facility{=FCAF}
frequency control and analysis center{=FCAC}
frequency control mode
frequency control reserve
frequency control reserves
frequency control system
Frequency conversion
frequency conversion
frequency conversion accessory{=FCA}
Frequency conversion circuit
frequency conversion circuit
frequency conversion controlling device of compressor
Frequency conversion (doubling)
frequency conversion stage
frequency conversion station
frequency converter
frequency converter decoupling
frequency converter{=FC}
frequency converter tube
frequency converting device
frequency convertor
frequency coordination
frequency coordinator
frequency, corner
frequency correction
frequency corrector
frequency correlation
frequency count
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