What is the 24th issue of Safety Science and Technology Paper 202 1?
Does the subject want to ask "which issue is the 202 1 24th issue of Safety Science and Technology Paper"? 2 1, the fourth issue. Security technology, 202 1, No.24, is 2 1, No.4. "Safety Technology" was founded on 200 1, which is a journal of safety science and disaster prevention sponsored by Shaanxi Automobile Chamber of Commerce of China International Chamber of Commerce.