The second “flammable and combustible (high-temperature and high-pressure) conditions, working in underground mines and other high-risk and dangerous work (the category of dangerous work can be decided by enterprises themselves according to specific situations); The third “3” refers to “implementing 3 safety projects”, physical isolation projects, Visualization Monitoring System projects, and dangerous work zero-violation projects, for improving safety production conditions and security levels; “6” refers to “promoting 6 items of safety management standardization”, management standardization in safety education, in danger source identification, management, and control, in dangerous work, in contractor safety, in personal protective equipment, and in safety checking.