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展览前言
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展览前言
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exhibition foreword
展览前言
展览开篇,独立成章,是简要说明、阐释展览主旨和目的的文字。又称序言。
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frequency shift
frequency-shift keying
frequency-shift keying, FSK
frequency-shift keying modulation and demodulation
frequency shift of scattering light
frequency shift theorem
frequency-shift track circuit
frequency-size distribution
frequency spectrum
frequency stability
frequency stability criterion
frequency stability measurement
frequency stabilization
frequency stabilized laser
frequency standard
frequency standards
frequency step
frequency sweep mode
frequency swept laser
frequency switching
frequency synchronization
frequency synthesis
frequency synthesized signal generator
frequency synthesizer
frequency table
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