What are the special types of work referred to in Tarim Oilfield (six are not allowed)?

Article 1 of the Prohibition: When a person without a valid special operation certificate takes up his post, the main body responsible for handling it is the post employee. The person responsible for arranging personnel without valid special operation certificate to work at their posts shall be dealt with according to Article 6. The scope of special operations includes electrician operation, metal welding and cutting operation, boiler operation, pressure vessel operation, pressure pipeline operation, elevator operation, lifting machinery operation, motor vehicle operation in the field (factory), refrigeration operation, blasting operation and well control operation, offshore operation, radioactive operation and dangerous chemicals operation.