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In the event of a fire, it will produce a lot of smoke.The right way to escape is to bend forward. But in the place such as department stores, supermarkets are ceiling lights.When a fire comes, smoke will block ceiling lights. It’s diffcult for people who are bending to escape to find lights. All of these, will threaten lives of people.
Shaanxi University of Science & Technology
Shaanxi University of Science and Technology