基于ARM11的轮船远程监控系统，通过3G网络传输，包括音视频传输，GPS信号获取和ARM11的485控制-ARM11 ship-based remote monitoring system, through the 3G network transmission, including audio and video transmission, GPS signal access and ARM11 485 control

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