在您的搜尋 主題建議
在您的搜尋 主題建議
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Washington, D.C. : [Springfield, Va.] : National Aeronautics and Space Administration, Scientific and Technical Information Branch ; [For sale by the National Technical Information Service], 1981
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Government Document
Conference Proceeding
圖書
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Washington : National Bureau of Standards; for sale by the Supt. of Docs., U. S. Government Printing Office, 1971
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Conference Proceeding
圖書
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