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Web-сайты
http://www.yanan.gov.cn/_info/content_792.htm (На китайском языке)
http://www.sgcc.com.cn (На китайском языке)
http://www.irem.it/en/pdf/DS0007-AF Filter Units.pdf (IREM, AF Series) http://www.brainydictionary.com/words/ri/ripple213718.html
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