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有一个交通工具类vehicle
- 有一个交通工具类vehicle,将它作为基类派生小车类car、卡车类truck和轮船类boat,定义这些类并定义一个虚函数用来显示各类信息。(There is a vehicle class vehicle. It is used as a base class to derive car of car, truck truck and ship boat. These classes are defined, and a virtual function is defined to displ