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http://destepti.ro/sonarul-acustica-subacvaticahttp://www.slideshare.net/ovylock/fenomene-acusticehttps://punisher2007.wordpress.com/2010/01/10/sonarul/http://www.physics.pub.ro/Cursuri/Nicoleta_Eseanu_-_Fizica_TET_Anul_1_(2014)/https://en.wikipedia.org/wiki/Sonar

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http://www.referatele.com/referate/fizica/online10/Ultrasunete-referatele-com.php