近几年来,木材供应一年比一年少,供求矛盾越来越大。从长远观点来看,要缓解这个矛盾,光靠国家调拨,或是伸手向国家要是不行的。必须面对现实,在节约代用上找出路。为此,北京市西城区房管局、器材加工厂在去年三月份承担了水泥门窗的试制任务。 In recent years, there has been less year-round supply of timber, and the contradiction between supply and demand has grown. From a long-term point of view, to ease this contradiction, it is impossible to rely on the state to allocate or reach out to the country. Must face reality and find a way to save on alternatives. For this reason, the Housing Authority and the equipment processing plant in the Xicheng District of Beijing undertook the trial production of cement doors and windows in March of last year.