《联邦航空条例》（14 cfr § 77 - SERP Analysis

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http://stage.hartzellprop.com/wp-content/uploads/149-0001-R20-Chinese.pdf

https://www.xuefeiji.org/public/uploads/files/20200306/1_202003062157496128c.pdf

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https://www.scribd.com/document/685304553/PPL%E6%89%8B%E5%86%8C3-3

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https://serp.tuningsearch.com/domain/ecfr.io