books helicopter impeller
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دفاعة مروحية (Info)
دَفّاعة مِروَحيَّة:- اسم لآلة دوَّارة لتحويل قوة الريح أو البخار أَو الماء المندفع إلى طاقة ميكانيكية تستخدم لتشغيل آلات أخرى (مكنز مجمع بيرزيت)
