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Date: 28-12-2016
1285
Date: 24-1-2017
1414
Date: 9-7-2017
1589
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Metals are conductors. There is no band gap between their valence and conduction bands, since they overlap. There is a continuous availability of electrons in these closely spaced orbitals.
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دراسة تحدد أفضل 4 وجبات صحية.. وأخطرها
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جامعة الكفيل تحتفي بذكرى ولادة الإمام محمد الجواد (عليه السلام)
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