“echo”的概念、定义、翻译、参考文献-科学参考

单词	echo
释义	echo [`ek·ō] ^ELECTRONICS 1. The signal reflected by a radar target, or the trace produced by this signal on the screen of the cathode-ray tube in a radar receiver. Also known as radar echo; return. 2. See <<ghost signal>> ^PHYSICS A wave packet that has been reflected or otherwise returned with sufficient delay and magnitude to be perceived as a signal distinct from that directly transmitted.
随便看	spectrum spectrum analysis spectrum analyzer spectrum level spectrum line spectrum locus spectrum of turbulence spectrum-selectivity characteristic spectrum signature spectrum signature analysis spectrum variable specular hematite specular iron specularite specular reflection specular reflection factor specular reflection model specular reflector specular surface specular transmittance speculum speculum alloy speech speech amplifier speech bandwidth

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