ما هو نوع المذيب الذي يمكن إضافته بنسبة 1.2% تقريبًا إلى قطران الفحم، وما هي طريقة الخلط حتى يتم فصل الزيت الخفيف عن الزيت الثقيل إلى طبقتين؟

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