现行初中物理教材中有“安全用电”的内容 ,我们经常也看到“高压危险”的标志 .高压有什么危险性 ?我们知道 ,高压触电有两类 ,一类是高压电弧触电 ,另一类是跨步电压触电 .当高压输电线的断头落在地面上 ,地面上与电线断头处距离不同的两点间存在着电压 ,当人走近电线断头处 The current junior middle school physics textbooks contain the content of “safety use of electricity”. We often see signs of “high voltage danger.” What are the dangers of high pressure? We know that there are two types of high voltage electric shock, one is high voltage arc electric shock, the other The class is a stepped voltage electric shock. When the end of the high-voltage transmission line falls on the ground, there is a voltage between two points on the ground and the distance from the end of the line break, when people approach the end of the wire break