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美国政府科技报告
>Investigation of DC-8 Nacelle Modifications to Reduce Fan-Compressor Noise in Airport Communities. Part 4 - Flight Acoustical and Performance Evaluations, for Period May 1967 - October 1969
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Investigation of DC-8 Nacelle Modifications to Reduce Fan-Compressor Noise in Airport Communities. Part 4 - Flight Acoustical and Performance Evaluations, for Period May 1967 - October 1969