【سؤال روزانه】فرآوری عمیق ۲۰۱۶۰۶۲۰، سؤال تک‌گزینه‌ای: چرا از پنبه شیشه‌ای برای عایق‌بندی در کارخانه‌ها استفاده می‌شود؟ زیرا ضریب هدایت حرارتی آن ( …) است.

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