لطفاً بفرمایید، کارخانه‌ای که ارتفاعش بیشتر از چند متر یا وسعتش بیشتر از چه مقداری باشد، نیاز به داشتن ۲ درب دارد؟ ؟ قانونی وجود دارد؟

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