Because of the importance of data transfer, this paper analyzes and explains realization of three methods of data transfer by turns. They are DDE, network socket, Distributed COM.

由于数据传输的重要性，本文对数据传输的三种方法：DDE、网络套接字和分布式COM逐个的进行了分析并讲解了各自实现的方法；

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This paper introduces the hardware design method of the client side and the at command used in the SOCKET communication.

介绍了客户端的硬件设计方法和SOCKET通信中要用到的AT命令。

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The paper introduces design principle of pipe well using socket and spigot connected cast iron pipes as pipe material. The results are effective.

论述了承插式铸铁管作井管的优点和设计原理，实践证明效果良好，值得推广。

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