自动售货机：先投入一定数目货币，然后根据货币购买力进行相应货物的选择，然后确定购买，出货并找零，完成交易。也可在确定购买前任何时刻按取消键退出所有货币。-Vending machine: put a certain number of first currency, and then carried out in accordance with the corresponding purchasing power of money to choose the goods, and then de