Sell hollowcore concrete SP slabs

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The hollowcore concrete SP slabs were promoted as a key achievement in science and technology by the Construction Department. And had won the first prize of Excellent New Product in the construction field; the second prize of the Science and Technology Progress; Century High Quality goods issued by the State Building Materials Bureau and the Countrys Authorized Standard Product by China Quality Test Association. Since July 1997, the Construction Project Quality Surveillance Stand in Langfang has exempted the SP slabs from inspection.