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单词 electromagnetic spectrum
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electromagnetic spectrum
electromagnetic spectrum n. = spectrum n. 3b.
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1924 Science 16 May 443/1 The electromagnetic spectrum considered as a whole extending from radio waves down to the shortest gamma rays of radium is briefly discussed.
1961 L. V. Berkner & H. Odishaw Sci. in Space i. 3 If we add the radio-frequency window to the narrow light-wave window, the sum gives astronomy about twenty octaves..of the electromagnetic spectrum with which to investigate the universe.
1999 T. Pratchett et al. Sci. of Discworld xiv. 110 If we look at the sky in the radio part of the electromagnetic spectrum, we can often ‘see’ things that are not apparent using ordinary visible light.
extracted from electromagneticadj.
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