https://drive.google.com/file/d/1LwYQ-k_UJDwBKTL761J-otZpTDVzt3Xb/view?usp=sharing
استخلاص الفلزات
https://drive.google.com/file/d/1VjL3blHcuv08ykAUukfOw7UEXXiSTfcn/view?usp=sharing
السبائك
