Owner of the shop. Food vendors and the theme parks will need to learn and understand about how. Open – close – open systems such as valves close to prevent mistakes. The accident, which may cause a fire.
The owner and the attendant food vendors will need to learn and understand how to turn on features - such as the opening and closing system - close the gas valve to prevent a crash. Accident that may have caused the fire.
The vendors, food and the host must learn and understand the characteristics of the method of opening and closing system, such as open. To close the valve gas to prevent mistakes. The accident which may cause a fire.