تابع المستوى الرفيع-الاحتكاك-الاتزان

[mohamed shabana]

بسم الله الرحمن الرحيم
http://www.arabruss.com/uploaded/72613/1246823887.jpg
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http://www.arabruss.com/uploaded/72613/1246824179.jpg
http://www.arabruss.com/uploaded/72613/1246824221.jpg

[معتز الخطيب]

الله يكـــــرمك