“critical frequency”的概念、定义、翻译、参考文献-科学参考

单词	critical frequency
释义	critical frequency [`krid·ǝ·kǝl `frē·kwǝn·sē] ^{ELECTROMAGNETISM} The limiting frequency below which a radio wave will be reflected by an ionospheric layer at vertical incidence at a given time. ^ELECTRONICS See <<cutoff frequency>> ^GEOPHYSICS The minimum frequency of a vertically directed radio wave which will penetrate a particular layer in the ionosphere; for example, all vertical radio waves with frequencies greater than the E-layer critical frequency will pass through the E layer. Also known as penetration frequency.
随便看	programmable counter programmable decade resistor programmable device programmable electronic system programmable logic array programmable logic controller programmable power supply programmable read-only memory program maintenance programmatic interface programmed check programmed dump programmed function key programmed halt programmed logic array programmed marginal check programmed operators programmed stop programmed turn programmer programmer analyst programmer-defined macroinstruction programmer's tool kit programming programming language

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