آیا ارتباط اجتناب‌ناپذیری بین درجات خطر آتش‌سوزی دسته‌های الف، ب، ج و درجات مقاومت در برابر آتش وجود دارد؟ ؟ یا مقرراتی وجود دارد؟ ؟

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