Briefly describe the four questions and four investigations on the job site. What are the four clear?

"four look": see if the safety measures on the job site meet the work requirements; Second, see whether the mental state of the workers is good, and whether the use and operation of safety instruments are standardized; Third, see if the danger point is clearly marked and whether there is a special person to monitor it; Fourth, see whether the pre-shift and post-shift meetings are effectively carried out to ensure the implementation of measures.

"four questions": first, ask about the responsibilities of the staff in place; Second, ask the person in charge of the work to arrange the measures and explain the dangerous points; Third, ask whether the safety disclosure of the operators is clear; Fourth, ask about the coordination and cooperation of all units and teams.

"four checks": first, check the arrival and arrival of managers at all levels; Check the implementation of personnel rules and regulations at all levels; Third, check the implementation of "two votes", safety measures and standardized work instructions; 4. Check the arrangement of on-site safety measures to ensure the implementation of responsibilities.