选煤厂正在进行技术改造施工。
铁路增建第二线、公路拓宽等工程的改造施工，近距离增建隧道是困难的。
During remoulding the railway and the highway, there are many difficult with small distance construction.
成立了《锅炉配套配件加工中心》制造A级，《锅炉安装维修改造施工》安装维修A级。
Set up a "boiler component parts processing center" manufacturing A, "Reconstructing the boiler installation and maintenance, " installation and maintenance of A-level.
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