1　问题的来源黄岗中学的 2 0 0 0年中考试题 ,有一个关于架设电线的问题 ,问题如下 :国家电力总公司为了改善农村电费过高的问题 ,目前正在全国各地农村进行电网改造。莲花村六组有四个村庄Ａ、Ｂ、Ｃ、Ｄ正好位于一个正方形的四个顶点 ,现计划在四个村庄联合架设一条线路。他 1 The source of the problem In the 2000 midterm test of Huanggang Middle School, there was a question about the erection of electric wires. The problem is as follows: In order to improve rural electricity tariffs, the State Power Corporation is currently carrying out power grid reconstruction in rural areas across the country. In the six groups of Lotus Village, four villages A, B, C, and D are located exactly at the four vertices of a square, and it is planned to jointly establish a route in the four villages. he