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You can learn about automatic control circuits, the basics and techniques of refrigeration and air conditioning, and the maintenance of various convenience store equipment (hot dog machines, microwave ovens, etc.).....
The boss sometimes speaks "particularly" loudly. It is best to have recreational skills such as playing cards and mahjong before joining the company, so you can better fit in with the master technicians... and they will be more willing to teach you... otherwise... hehe~