What are the technical jobs that require certificates?

At present, the technical jobs that need to hold the "Vocational Qualification Certificate" are: production and transportation equipment operation; Business, service industry and civilian personnel. Among them, the operators of production and transportation equipment are lathe workers, milling workers, grinder workers, boring workers, welders, cold-working sheet metal workers, machinists, fitters, tool fitters, auto mechanics, maintenance electricians, plumbers, concrete workers, steel bar workers, crane loader operators, boiler operators, modular machine tool operators, machining center operators, boiler equipment assemblers and boiler equipment operators. Scaffolder, waterproof worker, foundry worker, forging worker, high and low voltage electrical appliance assembler, electrical equipment installer, chemical inspector, food inspector, textile fiber inspector, metal heat treatment worker, painting worker, motor assembler, electronic instrument assembler, electrical instrument assembler, precision instrument repairman, substation equipment installer, decorator, antiseptic worker, manual carpenter and joiner. Business and service jobs include: Chinese chef, health care massage therapist, beautician, barber, photographer, shop assistant, salesman, refrigerator worker, Chinese pastry chef, western pastry chef, bartender, front desk waiter, computer operator, watch repairman, room attendant, household electronic product repairman, household electrical appliance repairman, photographic equipment repairman, publication distributor and computer operator. The types of staff are: telephone operators, customs officials and user communication terminal repairmen.