The production and business operation entities shall educate and train the employees in production safety, so as to ensure that the employees have the necessary knowledge of production safety, be familiar with the relevant rules and regulations of production safety and safe operation procedures, and master the skills of safe operation in their posts. Employees who have not passed the safety education and training are not allowed to work at their posts. Article 20 The main person in charge and safety management personnel of a production and business operation entity must have the knowledge and management ability of safety production that are suitable for the production and business operation activities of the entity. The main person in charge and safety production management personnel of the production, management and storage units of dangerous goods, as well as mining and construction units, shall be qualified by the relevant competent departments for their safety production knowledge and management ability before taking up their posts. The assessment shall not be charged. Article 21 The production and business operation entities shall educate and train the employees in production safety, so as to ensure that the employees have the necessary knowledge of production safety, be familiar with the relevant rules and regulations on production safety and safe operation procedures, and master the skills of safe operation in their posts. Employees who have not passed the safety education and training are not allowed to work at their posts. Twenty-second production and business units that use new technologies, new processes, new materials or new equipment must understand and master their safety technical characteristics, take effective safety protection measures, and conduct special safety education and training for employees. Twenty-third production and business units of special operations personnel must go through special safety training in accordance with the relevant provisions of the state, and obtain the qualification certificate for special operations before taking up their posts. The scope of special operations personnel shall be determined by the safety production supervision and management department of the State Council in conjunction with relevant departments of the State Council.