三点式振荡器是指LC回路的三个端点与晶体管的三个电极分别连接而成的电路，如图4-1（a）所示。图中三个电抗元件X1、X2、X3构成了决定振荡频率的并联谐振回路，同时也构成了正反馈所需的反馈网络。从相位条件看，要构成振荡器，必须满足： (1)极相连的两个电抗X1、X2性质相同。 (2)X1与X2、X3的电抗性质相反。-three-point refers to LC oscillator circuit with three transistors endpoint of three electr

一个基于TCP的网络开发项目，本项目利用自己设计通信协议从IBM服务器上下载数据经过解析后以电子地图的方式显示。-a TCP-based network development projects, The project uses its own communication protocol design from the IBM server and download data after parsed to the electronic map shows the way .