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الغاز و البترول و مشتقاته

   # المقالات 
1 دائرة تطوير الحقول
2 دائرة رقابة الإنتاج والتوزيع
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Breakthrough in Thin-Film Solar Cells
Scientists at Johannes Gutenberg University Mainz (JGU)  have come out with positive news about increased efficiency of thin-film solar cells. As we know that scientists are trying to increase the efficiency of the solar cells so that they can be considered as
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