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ايهما افضل نظام (220 فولت وتردد 50 هرتز) أم نظام (110 فولت و تردد 60 هرتز) ؟

الهرتز وحده قياس التردد

قواعد بيانات إكس إم إل
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Question added by اسماء عبدالله عرب
Date Posted: 2013/09/22
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haifa alsaab

( فولت و تردد هرتز لانه امن

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