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在20世纪70年代后期,我国逐渐采用了混凝土集中搅拌、商品化供应的方式,混凝土由专门的混凝土搅拌站提供,由混凝土搅拌运输车运送到各施工场所。一个搅拌站可以为半径20km以内的工地服务。20世纪90年代中期以
In the late 1970s, China gradually adopted the method of concentrated concrete mixing and commercial supply. The concrete was provided by a special concrete mixing station and transported to various construction sites by a concrete mixing truck. A mixing plant can serve a site within a radius of 20km. In the mid 90s