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ما هي نظرية 90 : 10 ؟

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Question added by Ahmed Ali , sales , Ibn Sina Pharm
Date Posted: 2016/02/02
ahmed ismail
by ahmed ismail , مشرف مبيعات , مدار جروب مصر

% من خط السير نحصل منه علي% من الهدف والعكس صحيح