频谱 (Chinese Wikipedia)

Analysis of information sources in references of the Wikipedia article "频谱" in Chinese language version.

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amazon.com

Alexander, Charles; Sadiku, Matthew. Fundamentals of Electric Circuits Second. McGraw-Hill. 2004: 761 [2010-07-04]. ISBN 0-07-249350-X. （原始内容存档于2020-05-19）. The frequency spectrum of a signal consists of the plots of the amplitudes and phases of the harmonics versus frequency.

Dictionary.com 互联网档案馆的存檔，存档日期February 23, 2008，.. The American Heritage Dictionary of the English Language, Fourth Edition. Houghton Mifflin Company, 2004. (accessed: January 25, 2008).

Dictionary.com 互联网档案馆的存檔，存档日期February 23, 2008，.. The American Heritage Dictionary of the English Language, Fourth Edition. Houghton Mifflin Company, 2004. (accessed: January 25, 2008).
Alexander, Charles; Sadiku, Matthew. Fundamentals of Electric Circuits Second. McGraw-Hill. 2004: 761 [2010-07-04]. ISBN 0-07-249350-X. （原始内容存档于2020-05-19）. The frequency spectrum of a signal consists of the plots of the amplitudes and phases of the harmonics versus frequency.