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並前往https://ntrs.nasa.gov/api/citations/19850018007/downloads/19850018007.pdf

Long Range Downwind Propagation Of Low-Frequency Sound

Of Low-Frequency Sound. (bASA-TU-E64C 5). LCPG EAblGk ECEIUIBC. NE5-26318. IiiOPA6AIICI OF ICh-EEOCUBICL SCUSL (USA). 21 p BC AaZ/BE 1C4. CSCL 2 0 ~.

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