0 Electric transformer uses, structure, efficiency & How it works March 27, 2018 by Heba Soffar · Published March 27, 2018 · Last modified September 4, 2019
0 The wave motion and the types of waves September 12, 2014 by Heba Soffar · Published September 12, 2014 · Last modified August 28, 2019
2 The advantages and disadvantages of PowerPoint skills June 8, 2015 by Heba Soffar · Published June 8, 2015 · Last modified October 15, 2019
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