旧式建筑,隔热材科用得较少,汽通整个建筑高度的竖井较少,开放的空间较少,砖石墙的抗火性能较好,而且窗户可以打开。现代建筑,多数设有吊平顶,在吸声板和莹光灯等的上空,有贯通该楼层统长和统宽的空间,坚井通道也较多,室内还有纸张、饰物、地毯等易燃物。当一座现代建筑起火时,许多存在于老式建筑中的控制因素大多失去。火势达到一定强度时,烟、火、热迅速带到其它空 Older buildings, with less heat-insulating materials, fewer shafts for the entire building height, fewer open spaces, better fire-resistance for masonry walls, and windows that can be opened. Modern buildings, most of which are equipped with flat ceilings, in the sky above sound-absorbing panels, fluorescent lamps, etc., have spaces that run through the length of the floor and the overall width of the floor. There are also many tunnels for the wells, and there are paper, accessories, carpets, etc. inside the building. Flammable materials. When a modern building catches fire, many of the controlling factors found in older buildings are mostly lost. When the fire reaches a certain intensity, smoke, fire and heat are quickly brought to other air