بسم الله الرحمان الرحيم
السلام عليكم ورحمة الله وبركاته
أهلا وسهلا بالأعضاء والزوار الكرام اليوم لدي لكم شرح وافي و حصري لفرع علوم المادة SM
أرجو التثبيت لأهمية الموضوع
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أدعو الله أن يوفقنا لما يحبه ويرضاه والسلام عليكم ورحمة الله وبركاته