“Fresnel zones”的概念、定义、翻译、参考文献-科学参考

单词	Fresnel zones
释义	Fresnel zones [frā`nel ´zōnz] ^{ELECTROMAGNETISM} Circular portions of a wavefront transverse to a line between an emitter and a point where the disturbance is being observed; the nth zone includes all paths whose lengths are between n-1 and n half-wavelengths longer than the line-of-sight path. Also known as half-period zones.
随便看	sampled data sampled-data control system sample design sampled grade sample function sampleite sample log sample path sampler sample size sample space sample splitter sample survey sampling sampling area ratio sampling bottle sampling distribution sampling error sampling fraction sampling gate sampling interval sampling pipe sampling plan sampling probe sampling process

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