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单词 adf
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ADF
ADF n. automatic direction finder.
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1939 Aero Digest June 24/2 (advt.) The ADF-6—Automatic Direction Finder: Primarily a powerful radio receiver offering direction finding... Learadio offers the ADF-6 as the latest contribution to the art of safe flying.
1966 McGraw-Hill Encycl. Sci. & Technol. (rev. ed.) IV. 231/2 Radio stations erected specifically for use with the ADF are known as NDB (non-directional beacons or radiophares).
2000 Public Admin. Rev. 60 247/1 The plane was equipped with only one automatic direction finder (ADF).
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