问题 问答题 简答题

简述什么是触电?

答案

参考答案:

1.触电是指人体因触及带电体或接近高压带电体而成为电流的通路的现象。

由于煤矿井下空气潮湿,空间狭小,照明不足,电气设备经常损坏绝缘,同时大巷运输广泛采用架线式电机车,井下人员触电事故时有发生。

2.触电的分类

按照触电时人体的伤害部位,通常将触电分为以下两类。

(1)电击伤

电击伤是指触电电流对人体内部组织的损伤,所以也叫“内伤”。电流流经人体,影响人的呼吸、心脏及神经系统,导致残废或死亡。电击伤是主要的触电事故,约85%以上的触电死亡事故是由于电击伤造成的。

(2)电灼伤

电灼伤足指触电电流的热效应对人体皮肤和肌肉组织的损伤,所以也叫“外伤”。电灼伤面积如果过大,往往会造成死亡。

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Who won the World Cup 1994 football game What happened at the United Nations How did the critics like the new play (1) an event takes place, newspapers are on the streets (2) the details. Wherever anything happens in the world, reporters are on the spot to (3) the news.
Newspapers have one basic (4) , to get the news as quickly as possible from its source, from those who make it to those who want to (5) it.
Radio, telegraph, television, and (6) inventions brought competition for newspaper. So did the development of magazines and other means of communication. (7) , this competition merely spurred the newspapers on. They quickly made use of the newer and faster means of communication to improve the (8) and thus the efficiency of their own operations. Today more newspapers are (9) and read than ever before. Competition also led newspapers to branch out into many other fields. Besides keeping readers (10) of the latest news, today’s newspapers (11) and influence readers about politics and other important and serious matters. Newspapers influence readers’ economic choices (12) advertising. Most newspapers depend on advertising for very (13) .
Newspapers are sold at a price that (14) even a small fraction of the cost of production. The main (15) of income for most newspapers is commercial advertising. The (16) in selling advertising depends on a newspaper’s value to advertisers. This (17) in terms of circulation. How many people read the newspaper
Circulation depends (18) on the work of the circulation department and on the services or entertainment (19) in a newspaper’s pages. But for the most part, circulation depends on a newspaper’s value to readers as a source of information (20) the community, city, county, state, nation, and world—and even outer space.

[A] offering [B] offered [C] which offered [D] to be offered