What certificates does Guangzhou's skill entry include?

According to the 20 19 Guangzhou Skilled Households, the certificates of Guangzhou Skilled Households include: welders (including welders, gas welders and chemical repair welders), rail train drivers (including EMU drivers, electric locomotive drivers, diesel locomotive drivers and urban rail train drivers), boiler equipment maintenance workers, substation equipment maintenance workers, construction machinery maintenance workers, and lifting and handling machinery operators (including cranes and electric locomotives) Industrial waste gas treatment workers, LCD device manufacturers, semiconductor chip manufacturers, semiconductor discrete devices and integrated circuits assembly and adjustment workers, transformer manufacturers, high and low voltage electrical appliances and complete sets of equipment assembly workers, mold workers, foundry workers, forging workers, metal heat treatment workers (including heat treatment workers), lathe workers (including CNC lathe workers), milling workers (including CNC milling workers), fitters (including assembly fitters) Electric loading and unloading machinery repairman, internal combustion loading and unloading machinery repairman, chemical maintenance fitter), grinder, stamping worker (including cold-working sheet metal worker, cold-working sheet metal worker, ship sheet metal worker, chemical maintenance riveting worker), electric cutter, Chinese medicine processor, refrigerator worker, manual carpenter (including fine carpenter), industrial solid waste treatment and disposal worker, and airport operation commander.