“expansion wave”的概念、定义、翻译、参考文献-科学参考

单词	expansion wave
释义	expansion wave [ik`span·shǝn ´wāv] ^{FLUID MECHANICS} A pressure wave or shock wave that decreases the density of air as the air passes through it.
随便看	pulse repetition rate pulse rise time pulse scaler pulse selector pulse shaper pulse spacing pulse-spacing modulation pulse spectrum pulse stretcher pulse subcarrier pulse synthesizer pulse-time-modulated radiosonde pulse-time modulation pulse tracking system pulse train pulse-train analysis pulse transformer pulse transmitter pulse-type altimeter pulse-type telemetering pulse voltage pulse wave pulse width pulse-width discriminator pulse-width modulated static inverter

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