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由甘肃省庆阳县长庆石油勘探局油建工程处混凝土预制品厂研制生产的长向钢铰线预应力空心板现已通过鉴定,投入批量生产。
The long-span steel hinged prestressed hollow slab developed and produced by the Concrete Prefabricated Products Factory of Changqing Petroleum Exploration Bureau of Qingyang County, Gansu Province has passed the appraisal and put into mass production.