北京市建筑材料以砖瓦灰石等行业发展最早,相传明朝修建北京城时所用砖的就是由48家官窑生产的。当时这些窑厂的规模较大,分布于四郊,主要生产手工 The earliest development of brick and gray stone in Beijing’s construction materials is the result of the fact that the bricks used in the construction of Beijing in the Ming Dynasty were produced by 48 kilns. At the time, the scale of these kiln factories was large and they were distributed in suburbs and mainly produced by hand.