“D layer”的概念、定义、翻译、参考文献-科学参考

单词	D layer
释义	D layer [`dē ´lā·ǝr] ^GEOLOGY The lower mantle of the earth, between a depth of 600 and 1800 miles (1000 and 2900 kilometers). ^GEOPHYSICS The lowest layer of ionized air above the earth, occurring in the D region only in the daytime hemisphere; reflects frequencies below about 50 kilohertz and partially absorbs higher-frequency waves.
随便看	reference locality reference lot reference mark reference material reference noise reference plane reference point reference range reference record reference rounds reference section reference seismometer reference signal level reference sound level reference spheroid reference station reference supply reference time reference tone reference vehicle reference voltage reference volume reference white reference white level referencing

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