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    3. ما معنى الراتنجات
    ما معنى الراتنجات

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    0  Views: 529 Answers: 1 Posted: 11 years ago
    Colleen

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    الراتنج في استخدام الأكثر تحديدا للمصطلح هو إفراز المواد الهيدروكربونية من كثير من النباتات، لا سيما الأشجار الصنوبرية
    Commented 11 years ago
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      11 years ago. Rating: 2
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