建筑物耐火等级与被动防火设施李引擎，孙才正建筑是人类生活、娱乐和生产活动的最基本建设。人们可以对建筑物这个总的概念进行各种具体的划分，例如可划分为建筑物与构筑物两大类；而建筑又可划分成为工业建筑，公共建筑，居住建筑等多种形式；另外根据建筑的高度又可划... The building’s fire-resistance grade and passive fire protection system Li engine, Sun Caizheng construction is the most basic construction of human life, entertainment and production activities. People can make various specific divisions of the general concept of buildings, for example, they can be divided into two categories: buildings and structures; and buildings can be divided into industrial buildings, public buildings, residential buildings and other forms; The height can be drawn again...