现代社会的人们不但利用地上发展高层建筑,还开发了地下空间,在我国一些曾经是人防工程的地下空间被用作商场、招待所等;地铁工程在继北京后,上海等地也陆续开始修建……一些地下空间的开发,使地下防火工程更显得重要了,因为地下发生火灾时,烟雾不容易排除,能见度低,会造成严重缺氧,疏散会很困难.如果掌握一点常识, People in modern society not only make use of the development of high-rise buildings on the ground, but also develop the underground space, which is used as a shopping mall and hostel in the underground space in some of our civil air defense projects. After the subway project is completed in Beijing, Shanghai and other places are also starting construction ... ... The development of some underground spaces makes the underground fire protection project even more important because the smog can not easily be removed in the event of underground fire and the visibility is low and it can cause serious oxygen deficiencies and evacuation can be very difficult.If you have a sense of common sense,