постоянного токо

http://www.coolreferat.com/%D0%A0%D0%B0%D1%81%D1%87%D1%91%D1%82_%D1%81%D0%BB%D0%BE%D0%B6%D0%BD%D1%8B%D1%85_%D1%8D%D0%BB%D0%B5%D0%BA%D1%82%D1%80%D0%B8%D1%87%D0%B5%D1%81%D0%BA%D0%B8%D1%85_%D1%86%D0%B5%D0%BF%D0%B5%D0%B9_%D0%BF%D0%BE%D1%81%D1%82%D0%BE%D1%8F%D0%BD%D0%BD%D0%BE%D0%B3%D0%BE_%D1%82%D0%BE%D0%BA%D0%B0_%D1%81_%D0%B8%D1%81%D0%BF%D0%BE%D0%BB%D1%8C%D0%B7%D0%BE%D0%B2%D0%B0%D0%BD%D0%B8%D0%B5%D0%BC_%D0%B7%D0%B0%D0%BA%D0%BE%D0%BD%D0%B0_%D0%9A%D0%B8%D1%80%D1%85%D0%B3%D0%BE%D1%84%D0%B0_2

 синосуидально токо  

http://toehelp.com.ua/lekcii/018.htm