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Renewable energies

Alternatív energiák felhasználása

dr. Péter Kádár 10 years ago - 31:11

A fény fizikája

Dr. Norbert Kroó 10 years ago - 51:35

Van-e jövőjük a megújuló energiaforrásoknak – és

Attila Meskó
Dr. György Fábri
10 years ago - 31:02